Samsung Galaxy S21 battery
(35 reviews)
Replacement battery for the Samsung Galaxy S21 (G991B). Restore your device's original runtime when the battery gets tired.
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.
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Published on 10/07/2026