Battery & Charger

The Mi 9 comes with a 3,300mAh battery. And before you say the word “only”, let me reintroduce a PSA we did years ago. Here’s why your 3,000mAh can last longer. And that article is still valid until today because the Snapdragon 855 has a smaller gate length, hence decreasing power consumption. With further optimization done to the architecture, the power efficiency is improved even further.

Hence, the Mi 9 is actually pretty high up in our battery life benchmark. Take a look at it.

ASUS ZenBook 13 UX333

Xiaomi Mi 9 battery life benchmark

Coming in at just shy of 13 hours, the Mi 9 can last you for a full day’s use quite easily – given that there is no gaming involved. Overall, a very powerful chip yet power efficient.

Charger

It’s funny how the Mi 9 is actually compatible with Qualcomm’s QuickCharge 4.0+ but Xiaomi only included a QuickCharge 3.0 charger. But that’s okay – since the QuickCharge 3.0 charger is till way faster than 5V 2A chargers.

Xiaomi Mi 9 battery charging curve graph

For the bundled QuickCharge 3.0 charger, it took about 20 minutes to reach 50% battery and about 33 minutes to reach 75% battery.

As for standard 5V 2A charger, it took about 39 minutes to reach 50% battery and about 68 minutes to reach 75% battery.


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REVIEW OVERVIEW
Design & Materials
9
Software
7
Connectivity and ports
7
Screen
9
Performance and gaming
10
Camera
8
Battery and charger
8
Value
10
The enthusiastic nanoelectronic engineer who found his way into simplifying the world of tech for everyone. Introverted, but noisy. Nice to meet you!