The Xiaomi Mi 9 In-Depth Review – 48MP Flagship FTW!

Xiaomi Mi 9 Processor, Memory + Storage, Setup, Battery Life + Recharging Speed

Qualcomm Snapdragon 855

Launched in February 2019, the Qualcomm Snapdragon 855 is a very powerful mobile SoC for flagship smartphones.

It combines eight Qualcomm Kryo 485 processor cores, with an Adreno 640 GPU, a Snapdragon X24 and X50 modems, a Spectra 380 camera ISP and a Hexagon 690 DSP.

Qualcomm Snapdragon 855 mobile SoC

The Qualcomm Snapdragon 855 uses a 1+3+4 cluster architecture :

  • one turbo-speed Kryo 485 Gold core running at 2.84 GHz,
  • three high-speed Kryo 485 Gold cores running at 2.42 GHz, and
  • four Kryo 485 Silver cores running at 1.8 GHz

In addition to an X24 LTE mode, the Snapdragon 855 also features the X50 modem, which allows it to deliver 5G mmWave connectivity.

 

Memory + Storage

The Xiaomi Mi 9 (64GB : US / UK / MY | 128GB : US / UK / MY) generally comes with 6 GB of LPDDR4x memory, with an 8 GB model in China.

Xiaomi does not allow anyone to check the amount of free memory, not even in Developer mode. But we used AIDA64 to confirm that with a clean system, it has 2.5 GB (42%) of free memory.

Xiaomi Mi 9 available storageThe Mi 9 comes with either 64 GB or 128 GB of internal flash storage. Our review sample came with 128 GB of storage, of which just over 115 GB (90%) is available for use.

This is enough space to store about 31,000 photos, or 16.5 hours of 1080p videos, or 6 hours of 4K videos.

We highly recommend you get the 128 GB model, because the Mi 9 does not offer expandable storage using a microSD card.

 

Setting Up The Xiaomi Mi 9

The Xiaomi Mi 9 (64GB : US / UK / MY | 128GB : US / UK / MY) runs on Android 9.0 Pie, so it is really easy to setup. It should take you no more than 7 minutes to set it up as a new device.

 

Battery Life

We tested the Xiaomi Mi 9’s battery performance using PCMark. It basically ran the PCMark work tests until its battery capacity dropped to 20%.

Xiaomi Mi 9 battery life

Work 2.0 Xiaomi Redmi Note 7 Xiaomi Mi 9 OPPO R17 Pro Samsung Galaxy S10+
Battery Capacity 4,000 mAh 3,300 mAh 3,700 mAh 4,100 mAh
Battery Life 12 hours 19 mins 12 hours 12 mins 11 hours 54 mins 10 hours 17 mins
Battery Utilisation 4.33 mAh / min. 3.61 mAh / min. 4.15 mAh / min. 5.32 mAh / min.
Review Links Redmi Note 7
Review
OPPO R17 Pro
Review
Galaxy S10+
Review
Price Check MY US | UK | MY MY | US US | UK | MY

IMPRESSIVE! Even with a relatively small 3,300 mAh battery, the Xiaomi Mi 9 (64GB : US / UK / MY | 128GB : US / UK / MY) lasted almost as long as the Redmi Note 7, which has a much larger 4,000 mAh battery.

This is not just screen-on time. It’s running the Work 2.0 benchmark over, and over again, for almost 12.25 hours!

 

Battery Recharging Performance

The Xiaomi Mi 9 (64GB : US / UK / MY | 128GB : US / UK / MY) supports Qualcomm Quick Charge 4, and up to 27 watts fast charging.

However, it only comes bundled with an 18-watt MDY-08-E1 fast charger. Well, let’s see how fast it recharges the 3,300 mAh battery!

Xiaomi Mi 9 battery recharging speed

Recharging Speed OPPO R17 Pro Xiaomi Mi 9 Samsung Galaxy S10+ Xiaomi Redmi Note 7
Battery Capacity 3,700 mAh 3,300 mAh 4,100 mAh 4,000 mAh
Charger Output 50 Watts 18 Watts 15 Watts 10 Watts
Recharging Time 33 Minutes 84.5 minutes 91.6 minutes 133 mins
Recharging Speed 90 mAh / min. 31.2 mAh / min. 35.8 mAh / min. 24.0 mAh / min.
Review Links R17 Pro
Review
Galaxy S10+
Review
Redmi Note 7
Review
Price Check MY | US US | UK | MY US | UK | MY MY

The Xiaomi Mi 9 (64GB : US / UK / MY | 128GB : US / UK / MY) took just over 1 hour 24 minutes (84.5 minutes) to recharge its battery from 20% to 100%.

This is good performance for its 18 watt charger, but falls short of the Samsung’s 15 watt charger that delivers 15% more juice with 16.7% less power consumption.

Thanks to its long battery life, it has a phenomenal battery life : recharging ratio of 8.7 : 1. A rule of thumb – for one hour of battery life, you only need to charge it for 7 minutes.

Next Page > Xiaomi Mi 9 Cameras, Triple Camera Comparison

 

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