Before leaving...

Thanks for your visite. If you like my work, you can support me with the following possibilities:
Subscribe to my YouTube channel
I post full test videos every month. By subscribing you will be notified of each new video, but the number of YouTube subscribers is important to obtain products to test.


Subscribe to my page on Facebook
I regularly post updates on Facebook, I also organize contests to win prizes. Here too, the number of fans is important to obtain material.


Use my links
I don't display ads on my site because I don't like it. My only source is from purchases you make from my links. I earn a meager commission on every purchase (about 2% on average), it costs you nothing and keeps me going. Here are some links to buy your products: == Aliexpress == Banggood

On this page:
Price Redmi Note 9s
First configuration
CPU / GPU Performance
Benchmark Antutu/3DMark
Network performance
Wifi performance
GPS performance
Battery range
Photo camera test
Photo quality
Video quality
Audio quality
Screen quality
Operating system
Test / Review conclusion
Questions answers

Notification new articles: YouTube Facebook
Receive notifications for new articles

Xiaomi Redmi Note 9s test, review and price

Xiaomi Redmi Note 9S test / review (detailed and unbiaised)
Category: Tests / Reviews

I tested several Xiaomi's last year and each time I came to the conclusion that no other brand could offer such a good price/performance/quality ratio. [b][b]At the beginning of 2020, I diversified my portfolio by testing a lot of other brands and I discovered Realme with the Realme 6 which finally offers a credible competition to Xiaomi...but for how long?[b][b]Xiaomi comes back with a new generation and my first Xiaomi this year will be the Redmi Note 9s which is positioned as an evolution of the Redmi Note 8 Pro while this one is still selling very well. I'm going to end up wondering if Xiaomi's biggest competitor isn't Xiaomi itself after all.[b][b][b][b][b]linkManufacturer web site:[b]

Structure of my tests

I test the phones according to a pre-established structure (see below) to provide you with as much information as possible. Unfortunately, this takes a long time. Some tests like network performance tests take several days and for photo tests I sometimes have to wait until the weather is suitable to take pictures in good conditions. I am therefore obliged to publish the tests step by step, so I invite you to come back if the test is not complete at the time of your visit.[b]
How are my tests different from others on the web?

- I usually buy the devices with my own money, so price is just as important as you are!
- I keep the devices for at least a few weeks (sometimes more) to see what they are worth in real conditions.
- I answer (when possible) your questions to help you decide before you buy
- no one pays me to do these reviews, so I'm completely neutral and independent...
- My pages are not filled with ads

Unihertz Tank : test / review
Xiaomi Mi 11 Lite test / review
Poco X3 Pro : test / review
Poco F3 Test / Review
Google Pixel 5 test / review
Poco X4 Pro 5G : test / review
Redmi Note 11 Pro+ 5G : test / review
Poco X4 GT : test / review
OnePlus Nord 2T test / review
POCO M5 : test, review and price

Price Redmi Note 9s

The list below shows the prices for the Redmi Note 9s from more than 50 sites around the world. If you are not satisfied with any price, you can subscribe to a price alert to be the first to be notified when the price drops.[b]bb
Xiaomi Redmi Note 9S Handy 64GB Dual SIM 6,67" Smartphone 5020mAh OVP Globale...
2023-01-29 07:16
156 EUR
Xiaomi Redmi Note 9S Smartphone, 6 GB + 128 GB, Grigio (Interstellar Grey)...
2023-01-29 13:57
157 EUR
Xiaomi Redmi Note 9S Smartphone,64GB, 4GB, Azul...
2023-01-29 11:34
169 EUR
Xiaomi Redmi Note 9S - Smartphone de 6.67" FHD+ (DotDisplay, Snapdragon 720G, 4 GB RAM, 64 GB ROM, c...
2023-01-29 11:34
169 EUR
Xiaomi Redmi Note 9S 6Go/128Go Bleu (Aurora Blue) Dual SIM...
2023-01-28 21:59
174 EUR
Redmi Note 9S - 64 Go - Blanc Glacier...
2023-01-28 21:59
178 EUR
helpThe above links are affiliate links from companies such as Amazon, Gearbest, Aliexpress,... If you appreciate my work, I would be grateful if you could purchase these products through these links. It costs you absolutely nothing but I get a small commission that allows me to buy the material I test. Thank you very much!


30/03/2020 Purchase of Redmi Note 9s on Aliexpress (seller: Xiaomi Spain)[b]14/04/2020 Phone delivered and unpacking can start[b][b]

Why this phone?

I mainly test phones sold between 200 and 300€, so I couldn't miss the launch of this new Redmi. Beyond the price aspect, this new Xiaomi comes with a solid proposal that will again push the limits of what you can buy for around 200€. [b][b]The Redmi Note 9s has a 6.67-inch screen, which is one of the largest screens in this price range. With this large screen, there is also a 5020 mAh battery, few devices do better. On the performance side it will tickle much more expensive phones.[b][b]For once, Xiaomi did not play the card of excess with the camera because the sensor offers 48 million pixels where Xiaomi has already ventured to 108 million on other devices.[b][b]


xiaomi redmi note 9s test avis review opinion revision recensione photo 2
[b]The boxes proposed by Xiaomi are not very original, we can see the picture of the camera and the box is quite compact. In the box we find the phone, a charger and its USB cable type C, a flexible semi-transparent case and a small manual. That's what you can find in most of Xiaomi's boxes.[b][b][b][b]
Length : 165.7
Width : 76.7
Thickness : 8.8
Weight : 209
Jack output : Yes
USB Type : Type C
USB norm : 2.0
Infrared port : Yes

First configuration

The Redmi Note 9s is released with MIUI 11 and the startup procedure has been slightly adapted. The first change concerns the general terms and conditions and the privacy policy, you will have to accept Xiaomi specific terms and conditions in addition to Google's ones. This is the first time I've seen this with Xiaomi.[b][b]The rest of the configuration is quite similar to what's done on other devices, only the configuration of the side fingerprint sensor has been moved to the very end after configuring the email accounts. [b][b]The side fingerprint reader is new to Xiaomi and the configuration of it was no problem, I didn't have to test the thumb in many different positions to finalize the configuration.[b][b]I had two crashes during the initial configuration, it didn't block the phone but it doesn't give a great impression.[b][b][b][b]


xiaomi redmi note 9s test avis review opinion revision recensione photo 18
[b]With each new generation, Redmi smartphones go up a range in terms of finish. The Redmi Note 8 was sober and elegant but didn't stand out much from other phones in this price range. The Redmi Note 9s takes a different direction with a metallic-looking back where blue mixes with green on a fairly reflective surface. The picture will probably give you the impression that the back is made of metal, but it is not, it sinks slightly when pressed. Despite this choice of material, the phone makes a good impression. This is the first time I see this choice of color at Xiaomi, the Xiaomi Mi 9 Lite uses the same kind of material but the color used was more classic. Most phones have a similar size and shape, only the color really differentiates them and this new Redmi does it very well with this metallic effect.[b][b]
xiaomi redmi note 9s test avis review opinion revision recensione photo 11
[b]At the top of the phone there are two small holes that are probably used to pick up sound and the infrared port. The loudspeaker is quite large, so this should make it easier to position the ear. [b][b]
xiaomi redmi note 9s test avis review opinion revision recensione photo 14
[b]At the bottom is a very classic configuration with an audio jack connector, a USB type C port and a grille for the external speaker.[b][b][b]
xiaomi redmi note 9s test avis review opinion revision recensione photo 12
[b]On the sides it is an old recipe with the SIM drawer on the left and the volume and ignition buttons on the right. The special feature of this new Redmi is the presence of a fingerprint sensor on the power button. This is the third phone that I test with this possibility, a trend seems to set up. I'll come back to this in the biometrics section.[b][b]
xiaomi redmi note 9s test avis review opinion revision recensione photo 18
[b]The absence of a fingerprint sensor on the back of the phone frees up the back of the phone by providing a virtually uninterrupted surface from end to end. Xiaomi has chosen to place the camera in the middle of the upper part with a block of 4 sensors that stand out quite strongly. It's been a long time that I found that the positioning of the camera at Xiaomi was not ideal, this time it's there, the sensor is in the middle, it's exactly what I wanted. A sensor in this position will reduce the risk of seeing your fingers on the pictures (especially in wide angle) but it will also reduce the effect of offset between what you see on the screen and the position of the camera, the offset will only be horizontal in this configuration.[b][b]As I was writing, the sensor comes out quite strongly from the back of the camera, it was already the case with the Redmi Note 7 but this time I find it less disturbing because it doesn't unbalance the phone when I put it somewhere. The protective shell also helps to reduce this effect.[b][b]
xiaomi redmi note 9s test avis review opinion revision recensione photo 20
xiaomi redmi note 9s test avis review opinion revision recensione photo 21
[b]The screen is huge, with its 6.67 inches it is impossible to use it with one hand. The screen takes up 84% of the available space, the edges are still visible but with each generation they get smaller. The borderless experience is currently reserved for high-end phones.[b][b][b][b]


[b]The information below comes from the Device Info HW application. The application provides detailed technical information about the tested phone.[b][b]

CPU / GPU Performance

CPU : Qualcomm Snapdragon 720G
GPU : Qualcomm AdreNo 618
Memory (RAM) : 4 - 6 Gb
Storage : 64 - 128 Gb
[b][b]The Redmi Note 9s is equipped with a Snapdragon 720G processor, this should in theory rank it a little above the Xiaomi Mi 9 Lite and the Redmi Note 8 Pro or the Realme 6. I'll come back to this point later because it far surpasses these devices in CPU performance.[b][b]For the GPU, the Redmi Note 9s is equipped with an Adreno 618 which again should rank it between the Xiaomi Mi 9 Lite and the Redmi Note 8 Pro and here again, it outperforms them all.[b][b]

Benchmark Antutu/3DMark

[b]I obtained a score of 274444 points with Antutu v8, this score ranks it again at the same level as Realme 6 and Redmi Note 8 Pro but if you look at the details I still notice some differences.[b][b]The score at the processor level (Snapdragon 720G) is surprising, it exceeds the Realme 6 as well as the Redmi Note 8 for a lower price.[b][b]Xiaomi generally has a lower memory performance than the competition but this is no longer the case with this Redmi Note 9s, it exceeds the Redmi Note 8 Pro by far.[b][b]If I have to summarize what I see here I would say that Xiaomi has managed to raise the bar once again. This Redmi Note 9s is a successor of the Redmi Note 8, it is sold in the same price range but with 59% more performance![b][b]The Redmi Note 9s is not a gamer phone but it offers enough performance to play most games in good conditions.[b][b][b][b] I got a score of 2492 points with 3DMark, this score puts it more or less at the same level as the Realme 6 and the Redmi Note 8 Pro. With this score, most games will work without problems.[b][b]
Antutu score : 274444
Antutu CPU : 100612
Antutu GPU : 71242
Antutu UX : 54036
Antutu Mem : 48554
3D Mark Open GL : 2492
3D Mark Vulkan : 2329
[b]Top 10 - performance ranking based on Antutu
1. Poco F4 Gt - 853016
2. Realme Gt - 811858
3. Black Shark 4 Pro - 759986
4. Poco X4 Gt - 714577
5. Oppo Find X2 Pro - 605184
6. Oneplus 8t - 595000
7. Poco F3 - 589677
8. Xiaomi Mi 10t Pro - 581650
9. Oneplus 8 Pro - 579417
10. Xiaomi Mi 10 - 579114

Number of smartphones in the ranking:149
Position of this smartphone in the ranking:60/149

Note: this ranking only contains the phones I tested as well as a few others that I added for reference.
[b]Gaming[b]To test the performance in game, I download the mobile PUBG game and evaluate the in-game experience, graphics level and depth of vision. This game is quite demanding and should help you evaluating the performance of a phone.With the score obtained with Antutu, the Redmi Note 9s should be able to run games like PUBG Mobile without any problems.[b][b]On the following video you can see that this is indeed the case. The game doesn't stutter, the frame rate is good and the depth of vision is maximum.[b][b][b][b]

Network performance

Redmi Note 9s covers European 4G frequencies, including support for the B28 700 Mhz for operators such as Free and Bouygues in France.[b][b]
3G frequencies : B1 (2100), B2 (1900), B4 (1700/2100 AWS A-F), B5 (850), B8 (900)
4G frequencies : B1 (2100), B2 (1900), B3 (1800), B4 (1700/2100 AWS 1), B5 (850), B7 (2600), B8 (900), B20 (800), B28 (700), B38 (TDD 2600), B40 (TDD 2300)
Bluetooth : Bluetooth 5.0 LE
SAR / head : 0.960
SAR / body : 1
Volte : Yes
VoWifi : Yes
NFC : No
Number measurements : 1860
Average signal : -99.4
Download speed : 150
Upload speed : 60
Choose your country to check if your phone is compatible:

The frequencies displayed below will allow you to see if this phone is compatible with your operator or if you will be able to use it in the country where you are going on vacation.

Signal 4G (before december 2020)[b]The ability to pick up the network correctly is an essential element for a phone but it is only very rarely measured. To measure a phone's ability to pick up the network, I perform a large number of measurements on the same cells to be able to compare phones under similar conditions. The signal is measured in dBm, a value of -90dBm indicates a worse signal than -70dBm. These measurements are therefore taken under real conditions and not in a laboratory, they are not scientific but give a good indication of performance. [b][b]Network signal sensitivity rating
Phone tested:Average signal (dBm)Number of measurements:
Xiaomi Mi 9t Pro-881600
Xiaomi Redmi Note 5-91.305600
Xiaomi Mi 9 Lite-93788
Samsung Galaxy A70-94.5111975
Nokia 5.3-94.98531
Realme 6-95.142301
Xiaomi Redmi Note 8 Pro-95.9221599
Xiaomi Mi A3-95.951000
Huawei Y6 2019-95.951199
Doogee S58 Pro-96.22856
Redmi 9a-96.481000
Meizu Note 9-96.68937
Motorola G8 Power-96.881032
Xiaomi Redmi Note 7-97.011430
Redmi 9c-97.041000
Umidigi S3 Pro-97.131200
Xiaomi Redmi Note 8-97.34879
Samsung Galaxy A21s-97.781000
Umidigi F1-97.82298
Ulefone Armor 7e-98.71000
Xiaomi Mi Note 10 Lite-991000
Honor 9x-99.14899
Xiaomi Redmi Note 9s-99.41860
Poco F2 Pro-99.81247
Xiaomi Redmi Note 9-100.791785
Xiaomi Mi 10 Lite 5g-100.881198
Poco X3-101.19821
Umidigi F2-101.47712
[b]The Redmi Note 9s is not the best in class for the network, it was already the case for the Redmi Notes 7 and 8, so there is no evolution here. I didn't encounter any problems using it but if you live in an area with low network coverage, this phone is not for you.[b][b]I have compared the Redmi Note 9s with its most direct competitor and if there is one point where the Realme is much better than the Redmi it is the ability to pick up the 4G network. The difference is quite obvious and the phones were in strictly identical conditions and I made over 1000 measurements for each device. [b][b][b][b]Signal 4G (from December 2020)[b]I decided to change the methodology for measuring the network because I noticed that the configuration of the mobile network changes over time. This makes it more difficult to compare phones because the conditions are no longer exactly the same.[b][b]To overcome this problem, I set up a device that captures 24 hours a day about ten parameters from the mobile network (ex: cell id, rssi, rsrq, snr, frequency,...). I then place the phone next to the device for 24 to 48 hours taking the same measurements so that I can compare them. [b][b] Overview of the phones tested with this methodology[b][b]
Phone tested:MeasurementsAvg signal (reference)Avg signal (phone)Min/Max (reference)Min/Max (phone)
Samsung Galaxy S10+457-93.06-97.39-89 / -98-97 / -99
Xiaomi Mi 9t Pro669-93.69-95.84-90 / -95-92 / -98
Poco F2 Pro1438-91.02-94.99-89 / -94-94 / -96
Xiaomi Mi 10 Lite 5g1645-90.77-95.02- 88 / -98-95 / -100
Poco X3821-94.89-103.19-91 / -97.7-101 / -104
Umidigi Bison2343-92.71-96.46-90 / -99-94 / -102
Oukitel C211101-92.04-94.99-90 / -97-92 / -95
Poco M31116-92.09-91.74-88 / -98-90 / -99
Xiaomi Mi 10t Pro1071-90.61-94.03-88 / -94-94 / -96
Umidigi A9 Pro981-90.40-94.01-88 / -95-93 / -95
Redmi Note 9t1201-92.149-91.71-90 / -97-91 / -97
Xiaomi Redmi Note 10999-92.35-93.99-88 / -97-92 / -98
Xiaomi Redmi Note 10 Pro877-89.72-90.56- 88 / -92-89 / -95
Poco X3 Pro1876-91.45-92.91-90 / -94-90 / -96
Poco F31382-90.79-94.2-89 / -94-93 / -98
Oneplus Nord N100896-91.23-96.005-88 / - 99-96 / -99
Xiaomi Mi 11 Lite2875-91.36-91.49-87 / -96-90 / -96
Samsung Galaxy A521427-89.27-93.39-87 / -98-92 / -96
Doogee S96 Pro1259-94.2-91.21-90 / -102-88 / -95
Xiaomi Redmi Note 10s957-92.07-97.62-90 / -102-96 / -102
Poco M3 Pro1247-91.76-102.97-99 / -104-88 / -98
Realme Gt843-96.49-94.02-93 / -101- 92 / -96
F150 R20221002-92.4-105.1-90 / -97-98 / -110
Umidigi Bison Pro936-94.2-104.98-91 / -98-95 / -105
Redmi 102141-94.74-100.92-92 / -98-99 / -101
Tcl 10 Pro871-93.43-94.001-92 / -96-93 / -95
Poco M4 Pro570-93.71-96.78-91 / -98-95 / -99
Google Pixel 51444-91.02-97.02-90 / -94-97 / -101
Xiaomi 11t1576-92.305-92.003-90 / -96-92 / -93
Redmi Note 111223-92.5-91.32-92/-97-90 / -93
Black Shark 4 Pro2383-95.178-95.42-90 / -100-93 / -101
Redmi Note 11 Pro349-95.33-93-89 / -101-92 / -94
Poco M4 Pro 4g1202-90.85-88.95-87 / - 95-88 / -98
Tcl 30 Se567-92.11-92.85-88 / -98-99 / -93
Poco X4 Pro562-92.06-94.01-90 / -95-95 / -93
Redmi Note 11 Pro Plus 5g945-93.5-93.54-91 / -97-92 / -97
Poco F4 Gt832-95.02-93.09-90 / -99 -93 / -97
Oukitel Wp181351-95.94-92.92-91 / -97-92 / -97
Poco X4 Gt387-96.99-96.505-96 / -98-95 / -98
Poco F4524-95.78-95.04-93 / -99-94/-96
Oneplus Nord 2t1340-98.83-96.305-95 / -102-90 / -99
Redmi 10a707-89.026-97.97-87 / -91-97 / -103
Poco M5762-95.18-95.07-98 / -93-99 / -94
[b][b][b][b]Download/Upload speed[b]To test the download speed, I have identified some 4G cells offering good performance where I test all my devices several times to see what download and upload speed they can achieve.[b]Top 10 - speed ranking in download
1. Samsung Galaxy S20 D:351Mbps U: 20Mbps
2. Poco X3 D:232Mbps U: 55Mbps
3. Xiaomi Mi 10 Lite 5g D:223Mbps U: 52Mbps
4. Poco F2 Pro D:207Mbps U: 53Mbps
5. Xiaomi Mi Note 10 Lite D:153Mbps U: 68Mbps
6. Xiaomi Mi A3 D:150Mbps U: 60Mbps
7. Xiaomi Redmi Note 9s D:150Mbps U: 60Mbps
8. Xiaomi Mi 8 Lite D:149Mbps U: 60Mbps
9. Samsung Galaxy A21s D:147Mbps U: 51Mbps
10. Huawei Y6 2019 D:145Mbps U: 61Mbps

Number of smartphones in the ranking:30
Position of this smartphone in the ranking:7/30

Note: the theoretical maximum speed of a telephone is often limited by the configuration of the mobile network and the congestion of the network at the time of the measurement. So maybe you could get a higher speed on another network
[b]I got a good speed score in 4G with the Redmi Note 9s. In download I got a speed of almost 150 Mbps and in upload I got almost 60 Mbps. Since these values seem to get stuck around 150 and 60, this is probably the maximum tolerated by the network or the maximum speed of the phone.[b][b]With such a speed you exceed the speed of all terrestrial VDSL connections.[b][b][b][b][b]

Wifi performance

To test a phone's ability to receive the network properly, I take measurements near my router and then remotely (and always at the same place). This gives me an average in dBm where a value of -90 dBm indicates poorer performance than a value at -30 dBm.[b]
Wifi frequencies : 802.11a, 802.11ac, 802.11b, 802.11g, 802.11n, 802.11n 5GHz
Download speed : 200
Signal / close : -18
Signal / distant : -65
Wifi signal[b]When I measure the signal close to the router I get a signal of -18 dBm, this is simply the best score I've gotten so far.[b][b]When I measure the signal at a distance I get a signal of -65 dBm, this is also the best score I've gotten so far.[b][b]The Redmi Note 9s exceeds here the performance of the Redmi Note 8 Pro which was already a very good phone for wifi.[b][b][b][b][b]Top 10 - wifi sensitivity ranking
1. Poco F2 Pro -11dBm
2. Xiaomi Redmi Note 10 Pro -12dBm
3. Realme Gt -12dBm
4. Samsung Galaxy A21s -13dBm
5. Redmi Note 11 Pro -13dBm
6. Oneplus Nord N100 -15dBm
7. Poco X3 Pro -15dBm
8. Poco F3 -15dBm
9. Redmi Note 9t -15dBm
10. Black Shark 4 Pro -15dBm

Number of smartphones in the ranking:68
Position of this smartphone in the ranking:24/68

[b]Download/Upload speed[b]To test the speed in Wifi, I connect to my router in 2.4Ghz and 5Ghz (if available) and use the Ookla application to measure the speed.I measured a wifi download speed of almost 200 Mbps. With this kind of speed, you will be able to stream in 1080p or play online without any problem.[b][b][b][b][b]Top 10 - wifi download speed ranking
1. Redmi Note 11 Pro Plus 5g 866Mbps
2. Poco F4 866Mbps
3. Poco F4 Gt 866Mbps
4. Poco X4 Gt 866Mbps
5. Oneplus Nord 2t 866Mbps
6. Black Shark 4 Pro 866Mbps
7. Poco M4 Pro 4g 433Mbps
8. Poco M5 433Mbps
9. Poco X4 Pro 433Mbps
10. Redmi Note 11 Pro 433Mbps

Number of smartphones in the ranking:66
Position of this smartphone in the ranking:36/66

Note: I have a 400Mbps line and a modem capable of delivering higher speed, but I can never be sure how much bandwidth is available when doing a test.

GPS performance

[b]To test the quality of the GPS signal I use the Offline Maps application and I make the same train trip in pedestrian mode. Why? In pedestrian mode, the GPS does not artificially correct the signal to stick to the road, it has no markings, so you can see the actual position. I then use an application to measure the accuracy of the signal. [b][b]The accuracy test shows that the Redmi Note 9s offers average GPS performance with an accuracy of 3 meters. The Redmi picks up 29 satellites and uses half of them for positioning. This accuracy should be enough to position it correctly in easy conditions but I'm not sure that the number of satellites is sufficient for more difficult areas such as woods or tunnels.[b][b][b][b]The road test shows that the Redmi Note 9s positions the car correctly without straying too far from the road. I couldn't test the GPS in difficult conditions but it is likely that the result is not as good because of the number of satellites used for positioning.[b][b][b]Top 10 - GPS accuracy ranking
1. Poco M5 1m
2. Poco X4 Gt 1m
3. Unihertz Tank 1m
4. Oukitel C21 1m
5. Redmi 9a 1m
6. Redmi 10a 1m
7. Doogee S96 Pro 1m
8. Xiaomi Redmi Note 10s 1m
9. Xiaomi Redmi Note 9 1m
10. Umidigi Bison Pro 1m

Number of smartphones in the ranking:40
Position of this smartphone in the ranking:0/40

Note: An accuracy of 3 meters or less can easily be corrected by a good GPS application. Phone performance also plays a role in how fast your display updates, so good accuracy could be compromised by too slow a display.

Battery range

Capacity : 5020
Fast charge : Yes
W max : 18
Range (100% brightness) : 663.00
Range (50% brightness) : 1876.00
Charging time : 224.00
Discharge speed (100%) : 0.15
Discharge score (100%) : 7.57
Discharge speed (50%) : 0.05
Discharge score (50%) : 2.68
Charging speed : 0.45
Charging score : 22.41
From March 2020, I replaced my subjective battery test with a technical test to better measure the real behaviour of the battery. Now I test the autonomy and charging time under absolutely identical conditions. I perform several measurements, so this test alone takes several days during which I cannot use the phone for anything else.

Battery life - methodology
To test the battery life, I measure the battery consumption every minute in strictly identical conditions to be able to compare phones and also to allow you to evaluate your phone in the same conditions. I rule out any influence of applications that could interfere with the measurement. The autonomy is not linear, the battery sometimes discharges much faster at the end. This is a frustrating phenomenon but with my measurements, you will know if you need to find a charger quickly.

Battery life
The battery of the Xiaomi Redmi Note 9s has a capacity of 5020 mAh and has discharged from 100% to 1% in 663.00 minutes with 100% brightness, it has discharged from 100% to 1% in 1876.00 minutes with 50% brightness. I obtain in this way an average discharge speed of 0.15% per minute with 100% luminosity and 0.05% per minute with 50% luminosity, the consumption is therefore 7.57 mA per minute with 100% luminosity and 2.68 with 50% luminosity. To be able to compare the efficiency of the phone and its influence on the battery, you have to compare the 7.57 (or 50%) score with that of other smartphones, the figure should be as low as possible.

Charging time - methodology
To test the charging time, I always use the same charger with the same cable. I measure the charging time minute by minute to see the evolution of the charge as well as the charging speed. The charging speed of a battery is not linear, it is often faster at the beginning and slower at the end. The charger is compatible with fast charging.

Charging time
The battery of the Xiaomi Redmi Note 9s has a capacity of 5020 mAh and has been charged from 1% to 100% in 224.00 minutes. This gives me an average charging speed of 0.45% per minute and therefore an increase of 22.41 mA per minute. To compare the performance of the Xiaomi Redmi Note 9s compared to other phones, you should use the 22.41 per minute score, this score should be as high as possible.

Important note: the charging speed is not always linear, the graph below gives you an indication of the battery behaviour.

The following table lists the phones tested with the technical battery test, they are ranked in order of efficiency. A higher battery capacity should logically result in a higher battery life but it is not always the case and it does not give any indication of the efficiency of a phone.

SmartphoneCapacity (mAh)Battery life (minutes)Efficiency ScoreBattery life (minutes) / 50%Efficiency Score / 50%Charging time.Score charging
Samsung Galaxy S204000565.007.081217.003.29136.0029.41
Nokia 5.34000549.007.291096.003.65199.0020.10
Oukitel C214000497.008.051324.003.02167.0023.95
Honor 9x4000770.005.191333.003.00151.0026.49
Google Pixel 54080773.005.281559.002.6281.0050.37
Umidigi A9 Pro4150552.007.521562.002.66112.0037.05
Xiaomi Mi 10 Lite 5g4160749.005.551541.002.70163.0025.52
Realme 64300704.006.111104.003.89162.0026.54
Poco F44500554.008.1211413.949845.92
Tcl 10 Pro4500465.009.68889.005.06133.0033.83
Samsung Galaxy A524500652.006.901239.003.63165.0027.27
Realme Gt4500574.007.841057.004.2687.0051.72
Black Shark 4 Pro4500425.0010.59937.004.8029.00155.17
Redmi Note 11 Pro Plus 5g4500525.008.5712113.7224187.50
Oneplus Nord 2t45006936.4914923.0212137.19
Poco F34520657.006.881840.002.46122.0037.05
Poco F2 Pro47001150.004.091536.003.06180.0026.11
Poco F4 Gt4700365.0012.8810824.3438123.68
Poco M3 Pro5000657.007.611647.003.04131.0038.17
Redmi Note 115000592.008.451 376.003.6369.0072.46
Poco M4 Pro5000634.007.891600.003.13123.0040.65
Motorola G8 Power5000912.005.482792.001.79311.0016.08
Redmi 105000664.007.531684.002.97165.0030.30
Umidigi Bison Pro5000610.008.201632.003.06255.0019.61
Redmi 10a50006827.3318202.7516330.67
Xiaomi Redmi Note 10s5000636.007.861556.003.21161.0031.06
Oneplus Nord N1005000808.006.191278.003.91663.007.54
Poco M4 Pro 4g5000723.006.921 500.003.3377.0064.94
Xiaomi Redmi Note 105000691.007.241728.002.89193.0025.91
Redmi Note 9t5000766.006.532054.002.43148.0033.78
Tcl 30 Se50006507.691 225.004.0817229.07
Samsung Galaxy A21s5000729.006.861283.003.90166.0030.12
Poco X4 Pro5000643.007.7813613.677467.57
Redmi 9a5000694.007.201902.002.63195.0025.64
Redmi 9c5000656.007.621915.002.61170.0029.41
Umidigi Bison5000550.009.091471.003.40238.0021.01
Xiaomi 11t5000476.0010.501204.004.1597.0051.55
Xiaomi Redmi Note 10 Pro5020625.008.031557.003.22213.0023.57
Xiaomi Redmi Note 95020650.007.721808.002.78162.0030.99
Xiaomi Redmi Note 9s5020663.007.571876.002.68224.0022.41
Poco X4 Gt5080726.007.0015383.3011344.96
Umidigi F25150927.005.561854.002.78299.0017.22
Poco X3 Pro5160648.007.961688.003.06138.0037.39
Poco X35160653.007.901654.003.12181.0028.51
Doogee S58 Pro5180845.006.131908.002.71177.0029.27
Xiaomi Mi Note 10 Lite5260827.006.361609.003.27208.0025.29
Ulefone Armor 7e5500768.007.161140.004.82179.0030.73
Poco M36000842.007.131898.003.16217.0027.65
Doogee S96 Pro6350929.006.841405.004.52424.0014.98
F150 R20228300879.009.441498.005.54243.0034.16
Oukitel Wp18125002 733.004.5728594.3736234.53

helpHow to read these figures?
The battery capacity is an important element in determining the autonomy of a phone but it is not the only factor. A phone with a large battery may have a shorter battery life if it consumes more power. If I had to take an example from everyday life, I would use the universe of the car. If a car has a large fuel tank, it should be able to drive a longer distance unless its average fuel consumption is higher. The battery efficiency score works the same way, it should be as low as possible and represents the energy consumption of the phone. These differences in efficiency are often related to the brightness of the screen, large bright screens will tend to consume more energy and even if they have a large battery, their range will be shorter.

In summary [battery product="xiaomi-redmi-note-9s" capa="5000" lg="en"][b]The Redmi Note 9s is equipped with above average battery capacity but with below average energy efficiency. Some phones with lower capacity have equivalent battery life.[b][b]It took 221 minutes to charge the battery, the charging speed is linear up to about 80%, the remaining 20% will take longer. Charging speed is above average.[b][b]It took 663 minutes to completely empty the battery, I got a much better score with the Motorola G8 Power which has the same battery capacity but lasted 1061 minutes. The difference is partly due to energy efficiency but also to the fact that the power save mode was not engaged by default (unlike the Motorola). [b][b]With this level of autonomy and normal use you should be able to last 2 to 3 days if you use the energy saver once you reach 20%.[b]

Photo camera test

To test the quality of photos produced by a phone, I do a technical test (resolution, sharpness, chromatic aberration,...) in studio (identical conditions) to evaluate the technical part objectively. From the second half of 2020, I built my own laboratory to take completely objective technical measurements. I then take pictures in real conditions to see how the camera performs. I then evaluate these photos according to my criteria but I publish the photos so that you can evaluate the result according to your criteria.[b]


Selfie / resolution : 16
Resolution : 48
Sensor : Samsung S5KGM2
Video resolution : 2160p
mm wide angle : 4.74mm
mm ultra wide angle : 1.65mm
The Redmi Note 9s is equipped with 4 sensors on the back, the main sensor is a Samsung S5KGM2 with 48 million pixels that can be found in other devices such as the Redmi Note 9 Pro or the Samsung Galaxy A51.[b][b]This is an evolution of the sensor used in the Redmi Note 8 which used a Samsung S5KGM1, the biggest difference is in the autofocus but I will have to test the camera to see if the difference is important.[b][b]Default app[b][b]The photo application of the Redmi Note 9s is very similar to the one used on the previous models of the brand, the differences are quite subtle. We find the following features:[b]- Photo[b]- 48M[b]- Portrait[b]- Night[b]- Panorama[b]- Pro[b]- Video[b]- Short video[b]- Slow Motion (120 fps, 240 fps, 960 fps)[b][b]The zoom controls are always displayed in superimposition of the photo capture area and they are always so difficult to read when the scene of the photo is clear, I regret that Xiaomi persists in this direction. If the icons were filled with a solid color or if they changed color according to the background image, it would make it easier to use.[b][b]The most important change (in my opinion) is in the settings where it is no longer possible to choose the resolution of photos and videos, so you can no longer choose to produce videos in 1080p or 4k. The resolution of the videos is not even visible anymore in the details of the videos in the gallery. Unless you transfer the video to your computer, you can't see what resolution you're shooting in.[b][b][b]

Photo quality

Photo test / studio[b]First example: ƒ/1.79 1/145 4.74 mm 100 ISO[b]
xiaomi redmi note 9s test avis review opinion revision recensione photo studio 1
[b]Exposure: slightly underexposed[b]Sharpness: good[b]Colours: slightly too dark[b]Depth of field: good[b]Distortion: none[b]Chromatic aberration: none[b]Vignetting: none[b]Digital noise: none[b][b]The main sensor of the Redmi Note 9s produces a correct result in the studio. The picture is still a bit too dark but this is the case for most phones and usually the pictures are even darker. The sharpness is however very good, the detail of the car's headlights are really visible, the Ford logo is also clearly readable.[b][b]Second example: ƒ/2,2 1/311 1,65 mm 100 ISO[b]
xiaomi redmi note 9s test avis review opinion revision recensione photo studio 2
[b]Exposure: strongly underexposed[b]Sharpness: medium[b]Colours: too dark[b]Depth of field: good[b]Distortion: none[b]Chromatic aberration: none[b]Vignetting: none[b]Digital noise: none[b][b]The Redmi Note 9s has a wide angle sensor with a focal length of 1.65mm which allows you to capture photos with a very wide angle. Not surprisingly, the photo taken with the wide angle is underexposed, it is the same for the vast majority of phones. The quality of the wide angle sensor at Xiaomi is always inferior to the main sensor, so this sensor should only be used in good light conditions.[b][b]Third example: ƒ/1.79 1/130 4.74 mm 100 ISO[b]
xiaomi redmi note 9s test avis review opinion revision recensione photo studio 3
[b]Exposure: almost correct[b]Sharpness: very good[b]Colours: almost correct[b]Depth of field: good[b]Distortion: none[b]Chromatic aberration: none[b]Vignetting: none[b]Digital noise: none[b][b]The zoom function is a digital zoom from the 48 MP version of the picture. The quality of this digital zoom is really good, the phone applies a contour enhancement that doesn't damage the photo, you can even see the dust that has settled on the car hood.[b][b][b]Photo test / sunny[b]First example: ƒ/1.79 1/878 4.74 mm 100 ISO[b]
xiaomi redmi note 9s test avis review opinion revision recensione photo sun 2
[b]Exposure: good[b]Sharpness: good[b]Colours: good[b]Depth of field: good[b]Distortion: none[b]Chromatic aberration: none[b]Vignetting: none[b]Digital noise: none[b][b]I have tested several phones from the Redmi range and have seen a progression in photo quality with each new generation. Photo quality depends mainly on two factors, the first is the physical sensor on the back of the camera and the second is the processing of the image. The sensor of the Redmi Note 9s hasn't changed much compared to the previous generation but I find that the processing has progressed well. Where Xiaomi tended to push the saturation too far to make the pictures more vivid, the Redmi Note 9s offers a better color balance. The colors are much more natural, the sharpness is good, the dynamics of the photo is overall very good. If I had to criticize the processing, I would say that the colors are slightly too warm but honestly this is quite acceptable.[b][b]At the same time I test the Realme 6 which is the most direct competitor of the Redmi Note 9s. I took a picture at the same place with only a few seconds difference.[b][b]EXIF: ƒ/1.8 1/776 5.58 mm 101 ISO[b]
realme 6 test avis review recensione opinion photo sun 1
[b]The Realme 6 is equipped with a Samsung Bright S5KGW1 sensor, this is the same sensor as the Redmi Note 8 Pro. I found that the pictures on the Redmi Note 8 Pro were too cold and here with the Realme 6, it's the opposite, the colors are warmer. From a purely technical point of view, the two pictures are the same but when you compare them next to each other, the color treatment of the Realme is quite visible. This is a choice made by Realme because I didn't get such warm pictures with the Redmi Note 8 Pro. I prefer the photo of the Redmi Note 9s but everyone will make their own opinion according to their taste.[b][b]Second example: ƒ/2,2 1/760 1,65 mm 100 ISO[b]
xiaomi redmi note 9s test avis review opinion revision recensione photo sun 3
[b]Exposure: good[b]Sharpness: good[b]Colours: good[b]Depth of field: good[b]Distortion: low[b]Chromatic aberration: none[b]Vignetting: none[b]Digital noise: light[b][b]I took a picture in the same place and at the same time with the wide-angle sensor. Wide-angle sensors generally deliver poorer pictures than the main sensor and the light conditions must be good to produce a good result. The light conditions were good for this picture and the result with the wide angle sensor is good too, I'm surprised because I wasn't expecting that. The color processing is more neutral than the main sensor, the sharpness is good whereas it is often a problem on this kind of sensor. There is a slight distortion on the edges and the sky is slightly noisy, these are minor defects. I hadn't yet seen a good wide angle sensor at Xiaomi, we'll have to see if it delivers such a good quality when the light is not so good.[b][b]Third example: ƒ/1.79 1/1146 4.74 mm 100 ISO[b]
xiaomi redmi note 9s test avis review opinion revision recensione photo sun 4
[b]Exposure: slightly under-exposed[b]Sharpness: good[b]Colours: too dark[b]Depth of field: good[b]Distortion: none[b]Chromatic aberration: none[b]Vignetting: none[b]Digital noise: none[b][b]\The zoom provided by the Redmi Note 9s is a digital zoom, so the sensor zooms inside a bigger image to give the impression of getting closer to the subject. Xiaomi usually applies sharpness processing that works quite well for this kind of picture, but this is not the case here. I don't understand what motivated them to make this choice because they strongly reduced the exposure time compared to the photo without zoom (yet it's exactly the same sensor) and the result is not very good. If you look at the EXIF, the zoom uses the same value for the diaphragm and the ISO but the exposure time decreases strongly. I repeated the operation several times in different places with the same result. I hope they will change this setting in an update because here the quality is lower than the previous model.[b][b]Here are other pictures taken in the same conditions, they confirm the diagnosis on the sensor. The Redmi Note 9s is able to produce very good pictures and in this price range, it's probably the best. Look at the level of detail in some of the following pictures, especially the flower, it's really not bad at all![b][b][b][b][b]Photo test / cloudy[b]First example: ƒ/1.79 1/1064 4.74 mm 100 ISO[b]
redmi note 9s tes avis review recensione opinion photo cloud 16
[b][b]Exposure: underexposed[b]Sharpness: good[b]Colours: too dark[b]Depth of field: good[b]Distortion: none[b]Chromatic aberration: none[b]Vignetting: none[b]Digital noise: none[b][b]Like most phones, the Redmi Note 9s produces photos that are too dark when the brightness is less favorable. I tested 3 other cameras at the same time as the Redmi Note 9s, so I was able to take pictures in strictly identical conditions and the exposure problem is visible on each camera. On the other hand, the sharpness is quite good, it should allow to recover the picture by increasing its lighting.[b][b]Here are some examples to compare:[b][b]Redmi Note 9s vs Umidigi F2[b]
redmi note 9s vs umidigi f2
[b]The Umidigi F2 produces a better illuminated photo but the colour processing is not good, the photo is too low in contrast.[b][b]Redmi Rating 9s vs Realme 6[b]
redmi note 9s vs realme 6
[b]The Realme 6 can be considered the closest competitor to the Redmi Note 9s but it does not do better than the Redmi Note 9s in these light conditions. The ground is brighter with the Realme but the sky is darker. The color temperature of the Realme is too warm. Even if the image is less well exposed, the processing of the Redmi Note 9s photo is better, it only lacks brightness while the Realme photo has other defects.[b][b]Redmi Note 9s vs Motorola G8 Power[b]
redmi note 9s vs motorola g8 power
[b]Motorola's main sensor does not compare with Redmi Note 9s.[b][b]Redmi Note 9s with GCAM?[b]GCAM is the photo application used by the cameras made by Google (the Pixel range), this application has the reputation of offering better image processing. I tested it on the Redmi Note 9s but it's quite unstable, it crashes regularly but I still managed to take some pictures. Pictures taken with GCAM don't have a signature at the bottom of the picture. You'll notice that GCAM doesn't offer a better result than Xiaomi's photo application.[b][b][b][b]I haven't yet found a camera in this price range that produces good pictures when the light is not good. You have to use the manual mode to avoid this kind of problem but I doubt that many people take the time to do so. So the Redmi Note 9s is still one of the best cameras in this price range despite under-exposed pictures.[b][b][b][b]Test photo / night[b]First example: ƒ/1.79 1/15 4.74 mm 14267 ISO[b]
redmi note 9s test avis review recensione opinion photo night 6
[b][b]Exposure: good[b]Sharpness: medium, smoothing at the edges[b]Colors: a little too warm[b]Depth of field: good[b]Distortion: none[b]Chromatic aberration: none[b]Vignetting: none[b]Digital noise: none[b][b]The Redmi Note 9s produces quite correct photos in night mode, I just find that the smoothing treatment is too pronounced, so the photo loses some detail on some areas. The colors are a bit too warm but it's not too disturbing. The digital noise is almost invisible. The night mode does not allow to change the sensor, this mode is only available on the main sensor.[b][b]Despite these positive points, I find that Xiaomi has regressed a bit from the Redmi Note 7 where I had really incredible results in night mode. If I compare the Redmi Note 9s to its most direct competitor (Realme 6), the Redmi wins the battle.[b][b]Here is a picture taken by the Realme 6 at around the same time:[b]
realme 6 test avis review recensione opinion photo night 1
[b][b]As you can see, Redmi may not be perfect but it produces better results than Realme.[b][b]I also wanted to push the cork further by testing the night mode proposed by GCAM with the Redmi Note 9s. This application is not stable but when it works, it is able to deliver good results for night photography:[b]
redmi note 9s test avis review recensione opinion photo night 2
[b][b]The result is really good. The sharpness is much better than with the default application, the colors are more faithful to reality, the depth of field is not extraordinary but it may be due to a slight movement during the shooting. I had tested GCAM in daylight and I had not obtained better results than with the default application but at night, GCAM produces a very good result.[b][b]Second example: ƒ/1.79 1/14 4.74 mm 25600 ISO[b]
redmi note 9s test avis review recensione opinion photo night 1
[b][b][b]Exposure: underexposure[b]Sharpness: medium, smoothing at the edges[b]Colors: a little too warm[b]Depth of field: good[b]Distortion: none[b]Chromatic aberration: none[b]Vignetting: none[b]Digital noise: none[b][b]It's the same observation as with the first photo, the treatment applies a too pronounced smoothing which made lose details but the photo is of much better quality than the Realme or the other cameras I tested at the same time (Umidigi F2, Motorola G8 Power). Here too the use of Gcam will improve the situation.[b][b][b][b][b][b]

Video quality

Stabilisation[b][b]Video stabilization is generally available on mid-range phones but is rarely effective. In the video below, I find that the result is better than what I'm used to seeing in this price range. You can still see a bit of the jerking caused by walking but it is well damped by the stabilization.[b][b]Video normale conditionsThe Redmi Note 9s has a 4k mode at 30fps and a 1080p mode at 60fps. By default the 1080p mode is enabled. The following video was filmed in 1080 60fps but YouTube may have taken some liberties for compression.[b][b][b][b]The quality of the video in daylight is really good, the colors are vivid, the sharpness is good and you can hardly see the changes in exposures where on other phones I see jumps in exposures. The overall video is pretty smooth. The Samsung sensor does a good job.[b][b]Slow motion video 960 fps[b]The Redmi Note 9s has an slow motion mode operating at 960 fps. Other Xiaomi's also offer this feature, so it's not new.[b][b]The 960 fps mode doesn't shoot continuously, that means you have about a second to shoot something in slow motion, so you have to aim well. You end up with a video of up to 10 seconds. It's a really annoying restriction but with a little bit of coordination you can get interesting results:[b][b][b][b]Video low light[b][b]The video is blurred from beginning to end, I hadn't seen it when I shot it. This means that to be sure to have a sharp video, you have to press the screen to indicate which area should be sharp because the phone might not detect this area on its own. Apart from sharpness, the colours are a bit too warm, the movements are quite fluid and the digital noise is very little visible because the Redmi applies a smoothing treatment. I'll try to make another video later by forcing the sharpness.[b][b]

Audio quality

To test the quality of the phone's audio output, I connect the device's audio output to a measuring tool, then play sounds on all frequencies and measure the differences between the original sound and the sound produced by the phone. In this way I measure the phone's ability to correctly reproduce all sounds.[b]
Frequency Respons : -+0.23 / -0.39
Noise Level : -92.6
Dynamic Range : -88.5
THD : 22.230
Intermodulation : 19.791
Stereo crosstalk : -88
Before starting my technical test I do a first subjective listening from the external loudspeaker and then with headphones.[b][b]The sound produced by the external loudspeaker is not very powerful, the trebles are quite pronounced and the bass sounds are not deep enough. With headphones, I feel the same lack of volume, in this case it is the treble that lacks sharpness while low frequencies are strong enough.[b][b]This Redmi Note 9s is not bad for the music but it is not the best Xiaomi has produced. At Xiaomi, the best smartphone for the sound I could test is the Mi 9T Pro but it's a much more expensive phone, so I compared the Redmi Note 9s with the Redmi Note 8 Pro.[b][b]Frequency Response[b]This test is intended to test the device's ability to correctly reproduce all frequencies. The white line in the middle of the graph is the ideal situation and the other colors come from tests on different phones. A deviation from the reference line indicates a deviation from the ideal situation. To see good sound at all frequencies, it is therefore necessary to get as close as possible to the reference line.
redmi note 9s frequency respons
[b]The Redmi Note 9s offers a frequency reproduction very similar to the Redmi Note 8 Pro except in the high frequencies where the Redmi Note 9s moves away from the reference more quickly. This is exactly what I experienced with my subjective listening through headphones, the reproduction of high frequencies is less good. [b][b]Dynamic Range[b]This test is designed to test a phone's ability to play sounds at different volume levels. Here too, the phones must be as close as possible to the reference.
redmi note 9s dynamic range
[b]Subjective listening revealed that the sound was not very powerful and this is also true in the technical test, the difference with the Redmi Note 8 Pro is quite visible.[b][b]Noise Level[b]This test aims to identify if the device under test is able to reproduce sounds without too much noise. A high score indicates a low parasite rate, a lower score indicates a higher presence of parasites.
redmi note 9s noise level
[b]The Redmi Note 9s has no interference problems, but again we can see that it deviates from the norm in the high frequencies. [b][b]The Redmi Note 9s is therefore slightly lower in sound than the closest model in the Redmi/Xiaomi range. In terms of sound, Samsung is still in first place with the S10+ and the A70.[b][b]Concert recording[b]The purpose of this test is to measure the recording quality of the phone when there is a lot of ambient noise. Since I don't have the opportunity to go to a concert every time I test a phone, I simulate the noise of a concert in a closed environment.The Redmi Note 9s is not the ideal candidate for live recording. It deviates from the reference in low frequency sounds, but this is the case for all phones. On the other hand, it deviates more strongly from the average in the high frequencies or it deviates strongly from the average from 1khz to 10khz. The high frequencies are therefore strongly distorted.[b][b]

Screen quality

To test the screen, I use a colorimetric probe that measures the color accuracy of a screen, as well as other parameters to see if a screen is able to correctly reproduce an image. I also test the brightness level to determine if the screen will be able to display an image in full sunlight.[b]
Screen size : 6.67
Resolution : 1080 x 2400
Ratio : 20:9
Protection : Corning Gorilla Glass 5
Type : IPS LCD
% occupancy : 84
dE white : 3.1
dE red : 1.0
dE green : 1.1
dE blue : 1.2
dE jaune : 1.2
dE cyan : 2.0
dE magenta : 0.7
Contrast : 1763:1
Brightness : 610
xiaomi redmi note 9s screen calibration
[b]Xiaomi generally produces good screens and I realize that every time I test other brands in the same price range, I rarely get similar results. When I started to test the Redmi Note 9s I was surprised to find an incorrect colorimetry and then I remembered that Xiaomi had gotten into the bad habit of configuring their screens to a too high saturation level. This gives the impression that the colors are more punchy but in reality, from a purely technical point of view, these colors are not correct. Fortunately, one click is enough to change the situation, you have to choose the standard colorimetry in the display settings. By making this manipulation, you go from a dE of 6 to a dE of 1.47, it's simply one of the best IPS screens I've ever tested. The eye perceives a color difference from a dE of 3, this Redmi is well below.[b][b][b]Top 10 - ranking of the best screens by colorimetry
1. Poco X4 Gt dE = 0.6
2. Xiaomi Mi 10 Lite 5g dE = 0.73
3. Xiaomi Mi 10t Pro dE = 0.83
4. Redmi Note 11 dE = 0.91
5. Google Pixel 5 dE = 1.11
6. Realme Gt dE = 1.17
7. Xiaomi Mi 11 Lite dE = 1.19
8. Xiaomi Redmi Note 8 dE = 1.2
9. Xiaomi Redmi Note 10 dE = 1.23
10. Poco M4 Pro 4g dE = 1.31

Number of smartphones in the ranking:69
Position of this smartphone in the ranking:15/69

Note: the colorimetric difference is measured in dE. After three, the human eye will perceive a colorimetric difference, so the dE should be the lowest. The tests were all carried out with a colorimetric probe.
[b]Brightness / Contrast[b]The Redmi Note 9s screen is bright enough with the automatic brightness adjustment to be used everywhere, I measured a brightness of almost 500 cd/m² with the brightness set to the maximum. If I simulate a strong light like the sun, the screen rises above 600 cd/m². With this level of brightness, you will be able to use the Redmi Note 9s in full sunlight without any problem. It is one of the brightest screens I have tested in this price range.[b][b] In terms of contrast, I measured a maximum contrast of 1763:1, this is a very high value for a screen of this type, this contrast will vary depending on the ambient brightness but with such a level of contrast, the screen of the Redmi Note 9s outperforms most other devices in this price range.[b][b]Light Absorption/Reflection[b]The smartphone screen reflect light and sometimes turn them into a real mirror. This mirror effect makes it harder to read. [b][b]The absorption index below indicates the percentage of light absorbed by the screen. The readability of a screen is better when the absorption index is high.[b][b]
Phone tested:% light absorption
Samsung Galaxy S10+58
Xiaomi Mi 9T Pro52
Honor 9x65
Redmi Note 9s55
Motorola G8 Power60
Realme 654
Umidigi F248
Poco F2 Pro52
Redmi Note 956
Xiaomi Mi Note 10 Lite53
Samsung Galaxy S2047
Samsung Galaxy A21s53
The phones tested have an average absroption rate of54 %


The particularity of the Redmi Note 9s is its fingerprint sensor on the side, this is the first time I test a Xiaomi equipped with this possibility.[b][b]Before testing the Redmi, I tested two other phones with this type of fingerprint sensor and I was not convinced because I could never find the right position to unlock the phone and I almost always ended up entering the pin code by hand. The Redmi works much better, the finger positioning is good and the detection is fast.[b][b]Even though the Redmi works well with its side fingerprint sensor and even though in theory it's a good idea, in practice I find that the fingerprint sensor on the back of the phone is still the most efficient method to unlock a phone.[b][b]

Operating system

The Redmi Note 9s is released with MIUI 11, I received an update a few days after the first use of the phone and I upgraded to MIUI 11.0.6[b][b]Here is a demo of the different screens available in MIUI 11:[b][b][b]If you've used MIUI before, you'll find your way back. I find that MIUI is getting closer and closer to the Samsung experience, there's not much missing to bring it to the same level. [b][b]I appreciated the return of the news feed on the left screen because this screen was reserved for a customization space in the previous version, I didn't find it very useful. [b][b]The application organization hasn't changed much, I see that it's no longer possible to uninstall an application from the application icon but it seems to be the case on all recent devices. [b][b]What I still miss at Xiaomi is an internal search engine that doesn't go looking for results on the internet. When you have too many applications, a search engine becomes really useful but here you have to go through Google to get results.[b][b][b]

Encoutered bugs

Not yet available / tested[b][b]

Accessories Redmi Note 9s

To better enjoy your experience with your smartphone, I offer links to all kinds of accessories that you might find useful

Protective cover / case xiaomi redmi note 9s
Screen protection film xiaomi redmi note 9s
Memory card xiaomi redmi note 9s
USB Cable / Charger xiaomi redmi note 9s
Headphones xiaomi redmi note 9s
Bike rack xiaomi redmi note 9s

Compare Redmi Note 9s with the others

I assigned a score of 1 to 10 for each test that determines the strengths and weaknesses of a product. I am using 0 for criteria that have not (yet) been tested. A score of 1 to 3 indicates poor performance (and yes, it does), a score of 4 to 6 indicates average performance, a score of 7 to 8 indicates good performance, and a score of 9 and 10 indicates exceptional performance. .
The score is calculated based on my measurements and when there are no measurements, it is a subjective opinion based on my experience.

The scores are not static, they change over time because the performance of new products changes and this must be taken into account.

Xiaomi Redmi Note 9s
Finish quality7.006.00
Battery performance7.008.00
CPU performance7.006.5
GPU performance7.006.5
Screen quality8.007.00
Photo quality7.005.00
Video quality7.005.00
Wi-Fi performance7.007.00
Mobile download speed7.005.00
Mobile network sensitivity6.006.00
Frequency coverage7.007.00
Audio quality7.006.00
GPS performance6.006.00
Operating system8.008.00
Overall score9889
Global ranking
1. Black Shark 4 Pro 114 / 140
2. Realme Gt 112.5 / 140
3. Oneplus Nord 2t 111.5 / 140
4. Poco F2 Pro 111.5 / 140
5. Samsung Galaxy S20 111 / 140
6. Poco F4 Gt 110.5 / 140
7. Google Pixel 5 109.6 / 140
8. Poco F3 108.5 / 140
9. Poco X4 Gt 108 / 140
10. Poco X3 Pro 107.5 / 140
11. Samsung Galaxy S10+ 107 / 140
12. Xiaomi 11t 107 / 140
13. Redmi Note 11 Pro Plus 5g 106.5 / 140
14. Xiaomi Mi 9t Pro 106 / 140
15. Xiaomi Redmi Note 10 Pro 105.5 / 140
16. Xiaomi Mi 11 Lite 104 / 140
17. Tcl 10 Pro 104 / 140
18. Samsung Galaxy A52 104 / 140
19. Redmi Note 11 Pro 103 / 140
20. Poco X4 Pro 102.5 / 140
21. Poco M4 Pro 4g 102 / 140
22. Xiaomi Redmi Note 10s 102 / 140
23. Poco M4 Pro 101.5 / 140
24. Redmi Note 11 101 / 140
25. Xiaomi Redmi Note 10 101 / 140
26. Xiaomi Mi Note 10 Lite 101 / 140
27. Xiaomi Mi 10 Lite 5g 101 / 140
28. Poco X3 101 / 140
29. Redmi Note 9t 100.5 / 140
30. Xiaomi Redmi Note 8 Pro 100 / 140
31. Poco F4 98 / 130
32. Xiaomi Redmi Note 9s 98 / 140
33. Doogee S96 Pro 98 / 140
34. Poco M3 Pro 98 / 140
35. Xiaomi Mi 9 Lite 98 / 140
36. Redmi 10 97.5 / 140
37. Xiaomi Redmi Note 8 97 / 140
38. F150 R2022 95 / 140
39. Umidigi Bison Pro 95 / 140
40. Poco M3 94.5 / 140
41. Xiaomi Redmi Note 7 94 / 140
42. Realme 6 93 / 140
43. Umidigi A9 Pro 92 / 140
44. Tcl 30 Se 92 / 140
45. Umidigi Bison 92 / 140
46. Oukitel C21 89.5 / 140
47. Nokia 5.3 89 / 140
48. Xiaomi Redmi Note 9 89 / 140
49. Xiaomi Mi A3 89 / 140
50. Motorola G8 Power 89 / 140
51. Oneplus Nord N100 88.5 / 140
52. Honor 9x 88 / 140
53. Xiaomi Mi 8 Lite 86 / 140
54. Meizu Note 9 86 / 140
55. Xiaomi Redmi Note 5 85 / 140
56. Umidigi S3 Pro 83 / 140
57. Samsung Galaxy A21s 82 / 140
58. Umidigi F2 82 / 140
59. Redmi 9a 81 / 140
60. Oukitel Wp18 81 / 140
61. Ulefone Armor 7e 80 / 140
62. Redmi 9c 80 / 140
63. Doogee S58 Pro 78.5 / 140
64. Honor 8x 78 / 140
65. Umidigi F1 77 / 140
66. Huawei Y6 2019 74 / 140
67. Poco M5 71.5 / 100
68. Xiaomi Mi 10t Pro 57 / 70
69. Redmi 10a 14 / 20
70. Elephone U5 0 / 0

Test / Review conclusion

I took more time than usual to test my smartphones because of the COVID containment which reduced the possibilities for my outdoor testing. Although some measurements are missing, I have enough information to draw a conclusion. I was expecting the Redmi to take a place among the top phones in this price range and not surprisingly, it is probably the best device you can buy in this price range. However, not everything is perfect, so you will have to check the different points of the evaluation according to your priorities and expectations in order to make the right choice.[b][b]I get a lot of questions about the comparison with the Realme 6. It is probably the most direct competitor of the Redmi Note 9s. If I look at the overall score, the Redmi Note 9s is better on many points, the Realme is not yet able to dethrone the Redmi Note 9s but if you have problems with some of the weak points of the Redmi, the Realme could become your best choice.[b][b]The competition is moving forward a little bit and Xiaomi is not alone anymore but Xiaomi's biggest competitor is...Xiaomi! The Redmi Note 9 Pro is coming soon, it's an almost perfect copy of the Redmi Note 9s, the two elements that will distinguish them are the camera and the fast charge. I'm also going to test the Redmi Note 9 Pro, so don't hesitate to check my other test.[b][b][b]Strengths[b]Quality/price/performance ratio[b]Screen[b]Daytime photo and night mode with Gcam[b]Battery[b][b][b]Weaknesses[b]Network performance in low coverage areas[b][b][b]Alternatives to this product[b][b]If you are looking for an alternative to the Redmi Note 9s, I see two devices that represent credible alternatives: the Redmi Note 8 Pro and the Realme. I have tested these two devices, so you can find the complete test on my blog.[b][b]I will try to summarize the strengths and weaknesses but the choice is sometimes a bit subjective. I won't compare them on size or finish because everyone will have a different preference.[b][b]Redmi Note 9s or Redmi Note 8 Pro?[b][b]Battery: Redmi Note 9s[b]Performance: no winners[b]Screen quality: Redmi Note 9s[b]Photo/video quality: Redmi Note 9s[b]Wifi: Redmi Note 8 pro[b]Network: not yet tested[b]Audio: Redmi Note 8 pro[b]GPS: not yet tested[b]Operating system: no winners[b][b]Redmi Rating 9s or Realme 6?[b][b]Battery: Realme 6[b]Performance: no winners[b]Screen quality: Redmi Note 9s[b]Photo/video quality: Redmi Note 9s[b]Wifi: No winners[b]Network: not yet tested[b]Audio: Realme 6[b]GPS: not yet tested[b]Operating system: no winners[b][b]

laurent willen Laurent Willen
Instead of watching nonsense on TV or YouTube, I spend my time in the evenings testing products and sharing my passion for technology, travel and photography.

I run this site in my own name and completely independently, no one pays me to do so.

I have more than 20 years of experience in the digital world, I have managed and developed many high traffic websites in companies in Belgium such as Mobistar, Microsoft, Immoweb, BrusselsAirlines, Proximus, Orange,...


Join the discussion / Ask your questions

Your comment will be published after validation. I respond to over 1500 comments a year in my spare time, so I can't always respond very quickly. Your email address will not be publicly visible and it will not be used for commercial purposes.

Be notified by email when a response is published