Xiaomi

REDMI 15 8 GB + 256 GB Grey

Name: REDMI 15 8 GB + 256 GB Grey
Brand: Xiaomi

Exceptional 7000 mAh battery and 144 Hz large display for heavy use.

Manufacturer reference 4223711624

Colour Grey

Black
Grey
Violet

Energy class View the energy label (PDF)

73 /100 Its best score: the best battery life, rated "very long" on its category’s scale.

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What the REDMI 15 8 GB + 256 GB Grey is worth

The Xiaomi REDMI 15 8 GB + 256 GB is a smartphone built for endurance and multimedia. Its 6.9" display delivers a 144 Hz refresh rate, while its 7000 mAh battery far exceeds the market median (4500 mAh), earning a battery score of 95/100.

Performance-wise, it packs 8 GB of RAM (expandable to 16 GB), a Qualcomm Snapdragon 685 processor built on 6 nm technology, and 256 GB of internal storage, expandable up to 2 TB. The 50 MP main camera scores 70/100, matching the segment median. The display, rated 73/100, covers 85 % of the NTSC color gamut with a peak brightness of 850 nits.

This model targets users seeking long battery life and a smooth screen for streaming or gaming, without the power or storage found in devices above 600 €. The 33 W fast charging, IP64 certification, and dual Dolby Atmos speakers reinforce its mid-range positioning.

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

7,000 mAh · category median: 4,500 mAh

Screen Good

6.9 " · category median: 6.7 "

Camera Good

50 MP · category median: 50 MP

Power Adequate

8 GB · category median: 8 GB

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 64.9 KB Document in Français Fiche d’information produit PDF 61.3 KB Document in Français

Specifications

Design 2

Product colour Grey

Protection rating IP64

Memory 3

RAM capacity 8 GB

Expandable RAM Up to 16 GB

Memory type LPDDR4X + UFS 2.2

Storage media 2

Internal storage capacity 256 GB

Compatible memory cards Expandable up to 2 TB

Screen 12

Display diagonal 6.9"

Display resolution 2340 x 1080 pixels

Maximum refresh rate 144 Hz

Maximum brightness 850 nits HBM

Typical brightness 700 nits

Colour gamut 85% NTSC

Contrast ratio 1400:1

Touch sampling rate 288 Hz

Pixel density 374 PPI

TÜV Rheinland Low Blue Light certification Yes

TÜV Rheinland Circadian Friendly certification Yes

TÜV Rheinland Flicker Free certification Yes

- 1

Battery capacity 7,000 mAh

Camera 5

Rear camera resolution (numeric) 50 MP

Front camera resolution (numeric) 8 MP

Rear camera aperture number f/1.8

Front camera aperture number f/2

Night mode Yes

Processor 5

Processor model Qualcomm Snapdragon 685

Processor cores 8

Maximum processor frequency 2.8 GHz

Process technology 6 nm

GPU Qualcomm Adreno

Weight and dimensions 4

Weight 224 g

Height 171.08 mm

Width 82.05 mm

Depth 8.55 mm

Software 1

Operating system installed Xiaomi HyperOS 2

Representation / rendering 3

Fast charging Yes

Fingerprint reader Yes

Face recognition Yes

Power 2

USB Type-C required charging power (max) 33 W

Reverse charging 18 W

Navigation 5

GPS (satellite) Yes

GLONASS Yes

Galileo Yes

BeiDou Yes

Electronic compass Yes

Network 10

Bluetooth Yes

SIM card capability Dual SIM

Wi-Fi Yes

Bluetooth version 5.0

Near Field Communication (NFC) Yes

2G bands GSM 2/3/5/8

3G bands WCDMA 1/5/8

4G FDD bands LTE FDD 1/3/5/7/8/20/28

4G TDD bands LTE TDD 38/40/41

Wi-Fi bands 2.4 GHz, 5 GHz

Connectivity 1

USB connector type USB Type-C

Sensors 4

Ambient light sensor Yes

Accelerometer Yes

Proximity sensor Virtual proximity sensor

Infrared emitter Yes

Audio 2

Audio Dolby Atmos

Audio certification Hi-Res Audio

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 screen, 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 7,000 mAh battery scores 95/100 for autonomy, well above the market median of 4,500 mAh. This capacity ensures much more than a full day of normal use.

Yes, the 6.9-inch screen offers a maximum refresh rate of 144 Hz and a touch sampling rate of 288 Hz, providing high fluidity for browsing and gaming.

Yes, the REDMI 15 supports memory cards and can be extended up to 2 TB, allowing plenty of extra space for photos, videos and apps.