Xiaomi

POCO X8 12 GB + 256 GB Black

Name: POCO X8 12 GB + 256 GB Black
Brand: Xiaomi

Exceptional 8340 mAh battery and 6.83" AMOLED screen for extended heavy use.

Manufacturer reference 4223718620

Colour Black

Black
Orange
White

RAM capacity 12 GB

8 GB
12 GB

Energy class View the energy label (PDF)

75 /100 Its best score: the best battery life, rated "very long" on its category’s scale.

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What the POCO X8 12 GB + 256 GB Black is worth

The POCO X8 packs 12 GB of RAM and 256 GB of storage in a generous format: 6.83" AMOLED screen displaying 2772 x 1280 pixels, protected by Corning Gorilla Glass Victus 2, with 120 Hz refresh rate and 3500 nits peak outdoor brightness. The 4 nm Snapdragon 6s Gen 4 processor ensures smooth performance, while 67 W fast charging and 5G, Wi-Fi 5 and Bluetooth 5.1 connectivity complete the package.

Very long battery life (95/100): the 8340 mAh silicon-carbon battery far exceeds the market median of 4500 mAh, guaranteeing several days of typical use. The 6.83" screen scores 72/100, the 50 MP rear camera (with OIS stabilization) reaches 70/100, and the 12 GB RAM achieves 80/100. The 256 GB storage remains at 58/100, below the current median of 384 GB. Overall score: 75/100.

This smartphone suits intensive users seeking exceptional battery life without compromising on screen size or fluidity. IP68 certification, dual stereo speakers with Dolby Atmos, and fingerprint and facial recognition sensors enhance daily comfort. The 223 g, 8.6 mm body remains manageable despite the large battery capacity.

Its scores, criterion by criterion

Scores out of 100, calculated from the datasheet and compared with the market. The full method is public.

Battery life Very long

8,340 mAh · category median: 4,500 mAh

Power Adequate

12 GB · category median: 8 GB

Screen Good

6.8 " · category median: 6.7 "

Camera Good

50 MP · category median: 50 MP

Storage Limited

256 GB · category median: 384 GB

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Documents

What the manufacturer publishes about this model. Each document opens in a new tab.

Étiquette énergie PDF 65.9 KB Document in Français Fiche d’information produit PDF 61.4 KB Document in Français

Specifications

Memory 1

RAM capacity 12 GB

Storage media 1

Internal storage capacity 256 GB

Design 1

Product colour Black

Screen 11

Display diagonal 6.83"

Display resolution 2772 x 1280 pixels

Panel type AMOLED

Maximum refresh rate 120 Hz

Maximum display brightness (Outdoor) 3500 nits

Display brightness 1060 nits

Screen protection Corning Gorilla Glass Victus 2

Pixel density 447 PPI

Touch sampling rate 240 Hz

Colour depth 12-bit

Contrast ratio 8,000,000:1

Camera 9

Rear camera resolution (numeric) 50 MP

Front camera resolution (numeric) 16 MP

Rear camera aperture number 1.8

Image stabilizer Yes

Image stabilizer type OIS

Second rear camera resolution (numeric) 2 MP

Second rear camera aperture number 2.4

Front camera aperture number 2.4

Video recording modes 1080p

Processor 4

Processor model Snapdragon 6s Gen 4

Processor cores 8

Etching technology 4 nm

Maximum processor frequency 2.4 GHz

- 1

Battery capacity 8340 mAh

Representation / rendering 3

Fast charging Yes

Fingerprint reader Yes

Face recognition Yes

Power 2

USB Type-C required charging power (max) 67 W

USB Type-C charging port Yes

Network 8

Mobile network generation 5G

Top Wi-Fi standard Wi-Fi 5 (802.11ac)

Bluetooth Yes

SIM card capability Dual SIM

SIM card type Nano-SIM

Wi-Fi Yes

Bluetooth version 5.1

Near Field Communication (NFC) Yes

Connectivity 1

USB connector type USB Type-C

Navigation 6

GPS (satellite) Yes

GLONASS Yes

BeiDou Yes

Galileo Yes

Quasi-Zenith Satellite System (QZSS) Yes

Electronic compass Yes

Software 1

Operating system installed Xiaomi HyperOS 3

Weight and dimensions 4

Weight 223 g

Height 163.45 mm

Width 78.27 mm

Depth 8.6 mm

Sensors 5

Proximity sensor Yes

Ambient light sensor Yes

Accelerometer Yes

Gyroscope Yes

Infrared emitter Yes

multimedia 1

Speakers stereo

Resistance 1

Protection rating IP66, IP68

Audio 1

Audio technologies Dolby Atmos, Hi-Res

Battery 1

Battery type Silicon-carbon

Battery life 1

Energy efficiency class B

Power management 1

Energy efficiency scale A to G

Who this model suits

It’s for you if

Your first criterion is the battery life: it happens to be its best score.

You want a good score on the power, above its category average.

You prefer a model tracked across several merchants, to buy at the right time.

Skip it if

Its lowest score is on the storage: skip it if that is decisive for you.

Frequently asked questions

Answers drawn from this model’s datasheet.

The POCO X8 features a silicon-carbon battery of 8340 mAh, nearly double the market median of 4500 mAh. This capacity earns it a battery score of 95/100, rated as very long, allowing intensive prolonged use without frequent recharging.

Yes, the 6.83-inch AMOLED screen offers a maximum brightness of 3500 nits outdoors and 1060 nits in standard use, with a 120 Hz refresh rate and Corning Gorilla Glass Victus 2 protection. This high brightness ensures optimal readability even in direct sunlight.

The document indicates Dual SIM capacity with Nano-SIM cards and 256 GB internal storage, but does not mention a microSD card slot. Storage remains fixed at 256 GB, which represents a score of 58/100, considered limited compared to the market median of 384 GB.