Xiaomi Mi 9 review

Display

The Xiaomi Mi 9 packs a 6.39" Super AMOLED screen of 1080p resolution with a waterdrop-like notch. The panel has a resolution of 1,080 x 2,340 pixels that makes up for a very decent density at 402ppi. It is also one of the tallest screens around with an aspect ratio of 19.5:9. That's not the highest number of pixels we've enjoyed but the display looks great and its punchiness makes every picture spring to life.

The display is protected by the latest Gorilla Glass 6 by Corning - the most shatter-resistant glass in the smartphone world. We are yet to see how it will pass the test of time, but seeing already other GG6-featuring phones, it is indeed doing great in drops, although it's rather prone to scratches.

The screen has a very decent brightness for an OLED panel of 430 nits - exactly what Xiaomi promises. But it can go as high as 620 nits in bright light if you leave it on Auto.

The sunlight contrast on the Xiaomi Mi 9 is excellent, and we expect nothing less from an AMOLED screen of that brightness.

Sunlight contrast ratio

• Apple iPhone XS
  5.171
• Apple iPhone X
  5.013
• Huawei Mate 20 Pro
  4.965
• OnePlus 5T
  4.789
• Samsung Galaxy S8
  4.768
• Asus ROG Phone
  4.765
• Samsung Galaxy S8+
  4.658
• Samsung Galaxy S9
  4.63
• Samsung Galaxy S6 edge+
  4.615
• Samsung Galaxy S9+
  4.537
• Samsung Galaxy Note9
  4.531
• Apple iPhone XS Max
  4.516
• Sony Xperia XZ3
  4.502
• Motorola Moto Z2 Play
  4.459
• Oppo R11
  4.454
• Samsung Galaxy S7 edge
  4.439
• Oppo RX17 Pro
  4.434
• OnePlus 3
  4.424
• Samsung Galaxy S7
  4.376
• Google Pixel 3
  4.35
• Huawei Mate 20 X
  4.337
• Samsung Galaxy A7 (2018)
  4.324
• OnePlus 6
  4.321
• Xiaomi Mi Mix 3
  4.291
• vivo NEX Dual Display (second display)
  4.289
• HTC One A9
  4.274
• LG V40 ThinQ
  4.256
• Oppo R15 Pro
  4.251
• Samsung Galaxy Note7
  4.247
• Samsung Galaxy A3
  4.241
• Nokia 8
  4.239
• Google Pixel 2 XL (pre-update)
  4.234
• OnePlus 3T
  4.232
• Samsung Galaxy A9 (2018)
  4.22
• Google Pixel XL
  4.164
• ZTE Axon 7
  4.154
• Samsung Galaxy Note8
  4.148
• Meizu Pro 7 Plus
  4.147
• OnePlus 6T
  4.138
• Samsung Galaxy S6 edge
  4.124
• Samsung Galaxy A7 (2017)
  4.124
• vivo V11
  4.113
• vivo NEX Dual Display
  4.108
• Huawei Mate 10 Pro (normal)
  4.096
• Samsung Galaxy Note5
  4.09
• Huawei P20 Pro
  4.087
• Xiaomi Mi 8
  4.086
• Meizu 15
  4.082
• Nokia 6 (2018)
  4.052
• Google Pixel 2 (pre-update)
  4.023
• LG V30
  4.022
• Huawei Nexus 6P
  4.019
• vivo NEX S
  4.012
• Honor Magic 2
  4.01
• Samsung Galaxy J7 Pro
  3.998
• OnePlus X
  3.983
• Vivo Xplay5 Elite
  3.983
• LG G7 ThinQ (outdoor)
  3.978
• Oppo R7s
  3.964
• Apple iPhone 7
  3.964
• Apple iPhone 8 (True Tone)
  3.957
• Huawei P9 Plus
  3.956
• Oppo Find X
  3.954
• Meizu Pro 6 Plus
  3.935
• Lenovo Moto Z
  3.931
• Xiaomi Mi 9
  3.921
• Samsung Galaxy A7 (2016)
  3.918
• OnePlus 5
  3.914
• Samsung Galaxy C5
  3.911
• Xiaomi Mi 8 SE
  3.901
• Samsung Galaxy C7
  3.896
• Samsung Galaxy A5
  3.895
• Samsung Galaxy J7 outdoor
  3.879
• Samsung Galaxy J2 outdoor
  3.873
• Motorola Moto G6 Plus
  3.865
• Samsung Galaxy A8
  3.859
• Samsung Galaxy A8 (2018)
  3.842
• Apple iPhone 6
  3.838
• Microsoft Lumia 950XL
  3.837
• Samsung Galaxy A6+ (2018)
  3.834
• Sony Xperia XZs
  3.818
• Samsung Galaxy A9 (2016)
  3.817
• Motorola Moto X (2014)
  3.816
• Samsung Galaxy J7 (2017)
  3.812
• Samsung Galaxy A5 (2017)
  3.804
• Samsung Galaxy J7 (2016) outdoor mode
  3.802
• Xiaomi Redmi Pro
  3.798
• LG V20 Max auto
  3.798
• Sony Xperia XZ
  3.795
• Samsung Galaxy A5 (2016)
  3.789
• Apple iPhone 6s
  3.783
• Meizu Pro 5
  3.781
• Microsoft Lumia 650
  3.772
• Xiaomi Mi 6
  3.767
• Sony Xperia XZ1
  3.765
• Samsung Galaxy J7 (2016)
  3.756
• Nokia 8 Sirocco
  3.745
• Sony Xperia XZ1 Compact
  3.729
• Apple iPhone 8 Plus (True Tone)
  3.725
• Oppo F1 Plus
  3.709
• Vivo X5Pro
  3.706
• Sony Xperia X Compact
  3.694
• Samsung Galaxy A3 (2017)
  3.688
• Huawei P20
  3.683
• Apple iPhone SE
  3.681
• Huawei Mate 9
  3.68
• Samsung Galaxy A7
  3.679
• Sony Xperia XZ2 Compact
  3.675
• Meizu PRO 6
  3.659
• BlackBerry Priv
  3.645
• Sony Xperia XA1 Ultra
  3.597
• Huawei Honor View 20
  3.597
• Apple iPhone 7 Plus
  3.588
• Sony Xperia XZ2
  3.58
• LG G6
  3.556
• Samsung Galaxy S5
  3.549
• Apple iPhone 6s Plus
  3.53
• Motorola Moto Z Play
  3.526
• Samsung Galaxy J3 (2016)
  3.523
• Samsung Galaxy J3 (2016) outdoor mode
  3.523
• Acer Jade Primo
  3.521
• Microsoft Lumia 950
  3.512
• Oppo R7 Plus
  3.499
• Nokia 7 plus
  3.479
• nubia Z11
  3.466
• Huawei P10 Plus
  3.456
• HTC U Ultra
  3.453
• Motorola Moto G6
  3.448
• Sony Xperia XA2 Ultra
  3.445
• Sony Xperia XA2 Plus
  3.445
• Samsung Galaxy J7
  3.422
• Motorola Moto G6 Play
  3.419
• Meizu MX5
  3.416
• LG V20
  3.402
• Samsung Galaxy A6 (2018)
  3.397
• Xiaomi Redmi Note 5 AI Dual Camera
  3.393
• LG G7 ThinQ
  3.39
• Huawei P10
  3.379
• Samsung Galaxy J5 (2016)
  3.378
• Oppo R9s
  3.352
• Honor Play
  3.349
• Samsung Galaxy J2
  3.235
• Oppo Realme 2 Pro
  3.235
• Motorola Moto X Play
  3.222
• Oppo F3 Plus
  3.218
• BlackBerry KEY2
  3.212
• Huawei Mate 9 Pro
  3.206
• Huawei P9
  3.195
• Xiaomi Mi Mix 2
  3.19
• Motorola Moto G7 Play
  3.18
• Motorola Moto G7 Power
  3.176
• ZTE Nubia Z17
  3.159
• Oppo R11s
  3.153
• Lenovo Vibe Shot
  3.113
• Honor 8X
  3.113
• HTC U11 Life
  3.108
• Motorola Moto X Force
  3.105
• LG Nexus 5X
  3.092
• HTC U11
  3.089
• Xiaomi Mi A2 Lite
  3.087
• HTC U12+
  3.085
• Xiaomi Redmi S2 (Y2)
  3.077
• Huawei Mate S
  3.073
• Oppo F9
  3.069
• Huawei P Smart 2019
  3.069
• Xiaomi Mi Max 3
  3.061
• Xiaomi Pocophone F1
  3.059
• Huawei Mate 20
  3.052
• Huawei Mate 20 Lite
  3.051
• Motorola One (P30 Play)
  3.026
• Motorola Moto G7
  3.011
• Motorola Moto G7 Plus
  3.01
• Oppo Realme 2
  3.006
• Sony Xperia L1
  2.994
• Sony Xperia X
  2.989
• LG Q6
  2.987
• Huawei P10 Lite
  2.974
• Samsung Galaxy Note
  2.97
• Xiaomi Redmi Note 6 Pro
  2.966
• Huawei P20 Lite
  2.952
• Xiaomi Redmi 5
  2.951
• Huawei Mate 8
  2.949
• Sony Xperia XA2
  2.938
• Oppo Realme 1
  2.932
• Razer Phone 2
  2.932
• Xiaomi Redmi 4
  2.92
• Xiaomi Redmi 3S
  2.913
• Xiaomi Redmi 5 Plus
  2.913
• Sony Xperia XA Ultra
  2.906
• LG G5
  2.905
• Huawei Honor View 10
  2.896
• Xiaomi Redmi 3s Prime
  2.893
• Xiaomi Redmi Note 7
  2.893
• Xiaomi Mi 5s Plus
  2.884
• Sony Xperia XZ Premium (sRGB)
  2.877
• Sony Xperia XZ Premium
  2.877
• Sony Xperia Z5
  2.876
• Nokia 3
  2.871
• Sony Xperia XZ2 Premium
  2.867
• Nokia 3.1
  2.837
• Realme U1
  2.815
• Lenovo Moto M
  2.813
• Nokia 7.1
  2.804
• Xiaomi Redmi 3 Pro
  2.803
• Sony Xperia Z5 compact
  2.784
• Honor 10 (Vivid)
  2.757
• Nokia 2
  2.752
• Meizu MX6
  2.751
• LG V10
  2.744
• Huawei Mate 10 (normal)
  2.742
• Motorola Moto G5S Plus
  2.737
• Xiaomi Redmi 3
  2.735
• Huawei Honor 7X
  2.734
• Xiaomi Redmi Note 4 (S625)
  2.714
• Meizu M5
  2.71
• Xiaomi Mi A2
  2.696
• Xiaomi Mi A1
  2.689
• Sony Xperia Z3
  2.618
• Xiaomi Mi 5X (Standard)
  2.616
• Sony Xperia XA
  2.609
• Motorola Moto G4 Plus
  2.582
• Motorola Moto G4 Plus (max auto)
  2.582
• Meizu M5s
  2.58
• Xiaomi Mi 4c
  2.574
• LeEco Le Max 2
  2.567
• Microsoft Lumia 640
  2.563
• Asus Zenfone 3 ZE552KL
  2.563
• Huawei P Smart
  2.563
• Xiaomi Mi Max 2
  2.561
• HTC U11+
  2.556
• Xiaomi Redmi Note 5A (Y1)
  2.556
• Lenovo Moto G4
  2.544
• Lenovo K6 Note
  2.544
• Oppo F1
  2.528
• Sony Xperia Z5 Premium
  2.525
• Huawei Honor 7 Lite / Honor 5c
  2.506
• Sony Xperia M4 Aqua
  2.503
• Huawei Honor 10 Lite
  2.497
• Lenovo Vibe K5
  2.459
• Meizu m3 max
  2.447
• Xiaomi Mi 5X (Auto)
  2.417
• HTC 10 evo
  2.407
• Huawei Honor 7
  2.406
• Vivo V7
  2.404
• Sony Xperia E5
  2.386
• ZUK Z1 by Lenovo
  2.382
• HTC 10
  2.378
• Oppo F3
  2.376
• vivo V5 Plus
  2.371
• Meizu m1 note
  2.362
• Huawei nova plus
  2.329
• Razer Phone
  2.328
• Huawei P8
  2.196
• Meizu M5 Note
  2.189
• Huawei Honor 6
  2.169
• Xiaomi Redmi Note 2
  2.166
• OnePlus Two
  2.165
• HTC One X
  2.158
• LG Aka
  2.145
• Xiaomi Redmi Note 4 (X20)
  2.145
• Archos 50 Diamond
  2.134
• Xiaomi Redmi Note
  2.119
• Xiaomi Mi 4S
  2.095
• Acer Liquid X2
  2.084
• Huawei P8lite
  2.078
• vivo V5
  2.059
• Moto G 3rd gen max manual
  2.026
• Xiaomi Mi 3
  2.001
• Xiaomi Mi Max
  1.996
• Sony Xperia E4g
  1.972
• OnePlus One
  1.961
• Sony Xperia Z2
  1.944

The screen supports the DCI-P3 color space and its color reproduction is extremely very accurate with an average deltaE of 1.5 and a maximum deviation of 3.1. These are the measurements we took in Standard Contrast mode.

If you leave it on Adaptive Contrast - it's on by default - the phone automatically adjusts colors based on the surrounding light so any measurements here would be irrelevant. Finally, the Increased Contrast mode makes for a more saturated look, mostly boosting greens and reds, but going a little easier on the blues.

Battery life

The Xiaomi Mi 9 is powered by a modest 3,300mAh battery - that's 100mAh less than the cell inside the Mi 8. The good news is the Mi 9 supports both wired and wireless fast charging. But here comes the tricky part.

The Mi 9 ships with an 18W charger within its box and by all means - it's doing a decent job with the 3,300 mAh battery. It can take a depleted battery to 45% in half an hour. But if that's not enough for you, for some extra $20 you can get yourself an even faster charger.

The Mi 9 supports 20W wireless and 27W wired charging called Charge Turbo. You can get both those goodies as part of the Xiaomi Mi 9 wireless charger bundle. You can't buy those pieces separately, but at that price, we'd say that's pretty understandable.

So, if you obtain this optional accessory and use the 27W charger inside its box, then you will charge your Mi 9 up to 70% in just 30 mins. It takes only 65 minutes to fully charge the Mi 9 with this adapter.

The wireless charger part of this bundle features a nice soft finish and is very lightweight. It's worth noting, that when using it, you can almost hear a slight hums during use because there is a small fan to cool the thing. We managed to charge the Mi 9 up to 30% in 30 minutes with this mat, not impressive and nowhere near the 45% we got with the 18W wired charger. Maybe it depends on the room and battery temp, but still, the quoted power output of 20W seems rather far-fetched.

And now, let's see how the Xiaomi Mi 9 and it's Snapdragon 855 chip did in our battery test.

Update, Mar 1: We've retested the Xiaomi Mi 9 after we found some issues with the original test data. The scoresheet and the test description below has been updated to reflect the changes. In short - the video test result went down, the web browsing test went up and the standby went a bit higher up, too. The end result is a slightly higher Endurance rating from 91h to 95h.

The Mi 9 posted an excellent endurance rating of 95 hours and great scores across the board. The screen-on-times are great - you can use it for 12 hours of web browsing and 16 hours of video playback.

The standby has improved noticeably since the Snapdragon 845 chipset and that helped the Mi 9 outscore the Mi 8 in this respect.

Our battery tests were automated thanks to SmartViser, using its viSer App. The endurance rating above denotes how long a single battery charge will last you if you use the Xiaomi Mi 9 for an hour each of telephony, web browsing, and video playback daily. We've established this usage pattern so that our battery results are comparable across devices in the most common day-to-day tasks. The battery testing procedure is described in detail in case you're interested in the nitty-gritty. You can check out our complete battery test table, where you can see how all of the smartphones we've tested will compare under your own typical use.

Loudspeaker

A lot of things have changed since the Mi 8, but the loudspeaker is not one of them. We were disappointed to find out that the Mi 9 doesn't boast stereo speakers. Instead, it has the same bottom-firing loudspeaker as the Mi 8 and it even scored the same Very Good mark at our loudness test.

It does sound very well with clean output and rich tones, though.

Audio quality

Xiaomi Mi 9 did well with an active external amplifier, delivering an output of above average loudness and flawless clarity.

It handled headphones well with a contained hike in stereo crosstalk the only notable change. Loudness remained above average too, adding up to a solid, if not quite spectacular performance.

Xiaomi Mi 9 frequency response

You can learn more about the tested parameters and the whole testing process here.