Xiaomi

Xiaomi 15T 12 GB + 512 GB Grey

Name: Xiaomi 15T 12 GB + 512 GB Grey
Brand: Xiaomi

512 GB storage, 12 GB RAM, 6.83" AMOLED screen and 5,500 mAh battery for long autonomy.

Manufacturer reference 4223711858

Colour Grey

Internal storage capacity 512 GB

256 GB
512 GB

Energy class View the energy label (PDF)

79 /100 Its best score: the most storage, rated "very large" on its category’s scale.

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What the Xiaomi 15T 12 GB + 512 GB Grey is worth

The Xiaomi 15T packs 512 GB of storage, 12 GB of LPDDR5X RAM and a 5,500 mAh battery that earns it an 85/100 autonomy score, well above the market median. Its 6.83" AMOLED screen displays 2772 x 1280 pixels with a 120 Hz refresh rate and brightness reaching 3,200 nits.

Photography relies on a 50 MP main sensor (Light Fusion 800) with OIS stabilisation, backed by a 50 MP telephoto lens and a 12 MP ultra-wide camera. The MediaTek Dimensity 8400-Ultra processor, built on a 4 nm process, uses an eight-core architecture and a Mali-G720 GPU. The 67 W fast charging promises a full battery in 50 minutes.

IP68 certified, this 5G dual SIM smartphone (Nano-SIM and eSIM) features Wi-Fi 6E, Bluetooth 6.0, NFC and a fingerprint reader. Weighing 194 g and measuring 163.2 x 78.0 x 7.50 mm, it suits those seeking generous storage, solid battery life and a spacious screen in a compact form.

Its scores, criterion by criterion

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

Storage Very large

512 GB · category median: 384 GB

Battery life Very long

5,500 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

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Documents

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

Étiquette énergie PDF 65.8 KB Document in Français Fiche d’information produit PDF 61.4 KB Document in Français

Specifications

Design 5

Product colour Grey

Screen protection Corning Gorilla Glass 7i

IP certification IP68

Water resistance depth 3 m

Vibration motor X-axis linear

Memory 2

RAM capacity 12 GB

RAM type LPDDR5X 8,533 Mbit/s

Storage media 2

Internal storage capacity 512 GB

Storage type UFS 4.1

Screen 11

Display diagonal 6.83"

Display resolution 2772 x 1280 pixels

Display brightness 3,200 nits

Maximum refresh rate 120 Hz

Panel type AMOLED

Pixel density 447 ppi

Colour depth 68 billion colours

Brightness dimming PWM up to 3,840 Hz

Touch sampling rate 480 Hz

Instant touch sampling rate 2,560 Hz

Contrast ratio 5000000:1

Camera 20

Rear camera resolution (numeric) 50 MP

Front camera resolution (numeric) 32 MP

Second rear camera resolution (numeric) 50 MP

Ultra wide-angle camera resolution 12 MP

Rear camera aperture number f/1.7

Second rear camera aperture number f/2.2

Front camera aperture number f/1.9

Main image sensor Light Fusion 800

Main sensor size 1/1.55"

Pixel size 2.0μm

Image stabilizer OIS

Digital zoom 60x

Video recording modes 4K 60 fps, 1080p, 720p

Slow motion mode Yes

Time lapse mode Yes

Night mode Yes

Dynamic range 13.2EV

Main equivalent focal length 23 mm

Ultra wide-angle equivalent focal length 15 mm

Telephoto equivalent focal length 46 mm

- 1

Battery capacity 5,500 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

Battery 2

Full charge time 50 minutes

Battery life cycles 1,600 cycles

Processor 5

Processor model MediaTek Dimensity 8400-Ultra

Manufacturing process 4 nm

CPU architecture 1x Cortex-A725 3.25 GHz, 3x Cortex-A725 3.0 GHz, 4x Cortex-A725 2.1 GHz

GPU Mali-G720

NPU NPU 880

Software 1

Operating system installed Xiaomi HyperOS 2

Weight and dimensions 4

Weight 194 g

Height 163.2 mm

Width 78.0 mm

Depth 7.50 mm

Network 8

Mobile network generation 5G

SIM card capability Dual SIM

SIM card type Nano-SIM, eSIM

Top Wi-Fi standard Wi-Fi 6E

Bluetooth Yes

Wi-Fi Yes

Bluetooth version 6.0

Near Field Communication (NFC) Yes

Navigation 6

GPS (satellite) Yes

Galileo Yes

GLONASS Yes

BeiDou Yes

Quasi-Zenith Satellite System (QZSS) Yes

Electronic compass Yes

Connectivity 1

USB connector type USB Type-C

Sensors 7

Proximity sensor Yes

Ambient light sensor Yes

Accelerometer Yes

Gyroscope Yes

Flicker sensor Yes

Colour temperature sensor Yes

Infrared emitter Yes

multimedia 2

Speakers Dual speaker

Audio Dolby Atmos, Hi-Res

Battery life 1

Energy efficiency class A

Power management 1

Energy efficiency scale A to G

Who this model suits

It’s for you if

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

You want a good score on the battery life, 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 camera: skip it if that is decisive for you.

Frequently asked questions

Answers drawn from this model’s datasheet.

The main 50 MP sensor uses a Light Fusion 800 with OIS stabilization and f/1.7 aperture, optimized for standard photos. The second 50 MP sensor with f/2.2 aperture serves as a telephoto with 46 mm equivalent focal length, for portraits and distant subjects.

Yes, with 5,500 mAh versus a market median of 4,500 mAh, this model scores 85/100 for battery life, rated as very long. Full charge takes 50 minutes with 67 W fast charging.

No, the Xiaomi 15T only accepts two SIM cards in Nano-SIM or eSIM format. The 512 GB UFS 4.1 internal storage cannot be expanded, but this capacity scores 90/100, rated as very large.