Xiaomi

REDMI 15 5G 4 GB + 128 GB Black

Name: REDMI 15 5G 4 GB + 128 GB Black
Brand: Xiaomi

Outstanding 7000 mAh battery and large 6.9" screen, limited to 128 GB storage.

Manufacturer reference 4223712938

Colour Black

Black
Green
Grey

Internal storage capacity 128 GB

128 GB
256 GB

RAM capacity 4 GB

4 GB
8 GB

Energy class View the energy label (PDF)

65 /100 Its best score: the best battery life, rated "very long" on its category’s scale.

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What the REDMI 15 5G 4 GB + 128 GB Black is worth

The Xiaomi REDMI 15 5G stands out with its exceptional 7000 mAh battery, scoring 95/100, well above the market median of 4500 mAh. Its 6.9" display with 144 Hz refresh rate and 2340 x 1080 resolution offers generous screen space, scoring 73/100.

Photography relies on a 50 MP rear sensor (f/1.8) and an 8 MP front camera, scoring 70/100. The Snapdragon 6s Gen 3 processor (8 cores, 2.3 GHz, 6 nm process) pairs with 4 GB RAM (expandable to 16 GB) and 128 GB UFS 2.2 storage, expandable to 2 TB. Power scores 45/100, storage 45/100.

33 W fast charging and 18 W reverse charging complement a battery certified for 1600 cycles at 80%. 5G connectivity, Bluetooth 5.1, NFC and IP64 certification make it versatile, running Xiaomi HyperOS 2.

This smartphone suits those prioritizing battery life and screen size, accepting baseline RAM and storage for the most demanding tasks.

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

Storage Limited

128 GB · category median: 384 GB

Power Low

4 GB · category median: 8 GB

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Documents

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

Étiquette énergie PDF 64.5 KB Document in Français Fiche d’information produit PDF 61.4 KB Document in Français

Specifications

Design 1

Product colour Black

Memory 3

RAM capacity 4 GB

RAM memory extension Up to 16 GB

RAM type LPDDR4X

Storage media 3

Internal storage capacity 128 GB

Compatible memory cards Expandable up to 2 TB

Storage type UFS 2.2

Screen 13

Display diagonal 6.9"

Display resolution 2340 x 1080

Maximum refresh rate 144 Hz

Display brightness 700 nits

Maximum display brightness (Outdoor) 850 nits

Colour gamut 85% NTSC

Touch sampling rate 288 Hz

Contrast ratio 1400:1

Pixel density 374 PPI

Low Blue Light certification Yes

Circadian Friendly certification Yes

Flicker Free certification Yes

Wet Touch technology Wet Touch 2.0

- 1

Battery capacity 7,000 mAh

Camera 7

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

Video recording modes 1080p at 30 fps

Lens 5P

Network 7

Mobile network generation 5G

Bluetooth Yes

SIM card capability Dual SIM

Wi-Fi Yes

Bluetooth version 5.1

Near Field Communication (NFC) Yes

SIM card format SIM 1 + hybrid (SIM or microSD)

Processor 4

Processor model Snapdragon 6s Gen 3

Processor cores 8

Manufacturing process 6 nm

Processor frequency 2.3 GHz

Software 1

Operating system installed Xiaomi HyperOS 2

Weight and dimensions 4

Weight 224 g

Height 171.08 mm

Width 82.05 mm

Depth 8.55 mm

Power 2

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

Reverse charging 18 W

Representation / rendering 4

Fast charging Yes

Fingerprint reader Yes

Face recognition Yes

Water and dust resistance IP64

Navigation 5

GPS (satellite) Yes

GLONASS Yes

Galileo Yes

BeiDou Yes

Electronic compass Yes

Sensors 4

Ambient light sensor Yes

Proximity sensor Yes

Accelerometer Yes

Infrared emitter Yes

multimedia 2

Speakers Dolby Atmos

Audio quality Hi-Res Audio

Battery 4

Charge cycles (80%) 1,600 cycles

Battery technology Silicon-carbon anode

Smart charging Smart charging 2.0

Battery health Battery health 4.0

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 power: skip it if that is decisive for you.

Frequently asked questions

Answers drawn from this model’s datasheet.

Yes. With 7000 mAh, this REDMI 15 5G scores 95/100 for battery life, well above the market median of 4500 mAh. The silicon-carbon anode battery guarantees 1600 cycles before dropping to 80% capacity.

Yes, via microSD card up to 2 TB. The slot is hybrid: either two SIMs or one SIM and one memory card. The 128 GB internal storage remains limited compared to the current median of 384 GB.

700 nits is the normal screen brightness, 850 nits is the peak outdoor brightness. This level allows reading the 6.9-inch screen in direct sunlight, with a 144 Hz refresh rate.