Samsung Galaxy S21 battery

Name: Samsung Galaxy S21 battery
Brand: Samsung
SKU: samsung-galaxy-s21
Rating: 3.2 (4 reviews)

(4 reviews)

Replacement battery for the Samsung Galaxy S21 (G991B). Restore your device's original runtime when the battery gets tired.

See price and availability on Amazon

Buy at Amazon

As an Amazon Associate I earn from qualifying purchases.

Characteristics

Capacity: 4000 mAh
Compatibility: Galaxy S21
Type: Lithium-ion
Use: Replacement battery
Original runtime restored, Galaxy S21

Detailed overview: Samsung Galaxy S21 battery

This replacement battery EB-BG991ABY is designed for the Samsung Galaxy S21 (G991B). Over time, the original battery loses capacity and runtime drops: replacing it gives your device a full day of use again.

With a capacity of 4000 mAh, it matches the original battery's characteristics. Before ordering, be sure to check the exact reference of your battery (EB-BG991ABY) and the precise model of your device, as variants exist across series.

Tip: a spare battery charged in advance is also a handy safety net for outings, travel or long sessions, so you never run out at the wrong moment.

EAN: 4251488637967

Need help choosing?

Is my battery allowed on a plane? Enter your battery capacity: we tell you if it can go in the cabin and suggest compliant models. Open the calculator → What does my energy really cost? The real cost per stored kWh over the whole lifespan: compare the true value of batteries. Open the calculator →

Other products in the "Smartphone batteries" category

Apple iPhone 15 battery

See price (4)

Your iPhone 15 no longer lasts the day? A new 3349 mAh battery restores its original runtime, easy to fit yourself at a low price.

View product

Apple iPhone 16 battery

$23.15

Restore your iPhone 16's full runtime: a new 3561 mAh battery, easy to fit yourself to extend your smartphone's life at a low price.

View product

Samsung Galaxy S22 battery

See price (21)

A drop-in replacement for the Samsung Galaxy S22 (SM-S901U): genuine-fit EB-BS901ABY battery, 3700 mAh, to bring back a full day of battery life.

View product

Samsung Galaxy S24 battery

See price (10)

Screen time shrinking on your Galaxy S24? A fresh EB-BS921ABY cell, rated for the original 4000 mAh, and a full toolkit bring the battery back to day one.

View product

Published on 02/09/2026