For Samsung Galaxy S21 3880mAh EB-BG991ABY Battery Replacement
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Estimated delivery · Royal Mail Tracked 482–3 working days
- Order placedToday
- DispatchedSame day
- At your door2–3 days
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Phone parts are delicate. We recommend fitting by a qualified repair technician — damage caused during fitting is not a product fault. Need help choosing the right part? Call 07425 443625 or email info@therepairplus.com (Mon–Fri 10:00–18:00). Repair shop? Open a trade account.
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The Repair Plus Samsung Galaxy S21 5G 3880mAh EB-BG991ABY replacement battery is a brand new internal battery for the Galaxy S21 (SM-G991B) that fixes fast drain, sudden shutdowns and a phone that no longer lasts the day. Built to OEM standard fit and connector layout, it is tested before dispatch and shipped the same day from Manchester when you order before 4pm, Monday to Friday.
Key features
- EB-BG991ABY type: matches the battery model code used in the Galaxy S21, which makes it easy to confirm you have the right cell.
- 3880mAh rated capacity: the rated figure for this battery type, restoring the runtime your phone had when it was new.
- Connector and size to OEM standard: sits in the frame and plugs into the board exactly like the part it replaces.
- Tested before dispatch: checked before it leaves us, so you can fit it with confidence.
- For DIY and trade: a reliable stock line for repair shops handling S21 battery jobs.
Specifications
| Part | Internal replacement battery |
|---|---|
| Capacity | 3880mAh |
| Battery type | EB-BG991ABY |
| Compatible model | Samsung Galaxy S21 5G (SM-G991B) |
| Condition | Brand new |
| Quality | OEM standard |
| Dispatch | Same day before 4pm, Monday to Friday, from Manchester, UK |
| Returns | 30 days |
Compatibility
Fits the Samsung Galaxy S21 5G (SM-G991B and other G991 variants) only. It does not fit the Galaxy S21 Plus (SM-G996B), Galaxy S21 Ultra (SM-G998B) or Galaxy S21 FE (SM-G990B), which each use a differently sized battery. Check your model number in Settings > About phone before ordering; the model number is listed near the top of that screen.
If you have already opened the phone, the EB-BG991ABY code printed on the old battery label is a quick way to confirm this is the right replacement.
What you need to fit it
Replacing the battery means removing the back cover first. You will need a heat pad or heat gun, a suction cup, plastic opening picks, a small Phillips screwdriver, battery adhesive strips or a battery removal solution, and a new back cover adhesive to reseal the phone. Disconnect the battery flex before lifting the old cell, and never bend or puncture a lithium battery. Once the phone is sealed, charge it fully and use it normally for a few cycles so the battery reading settles.
Why buy from The Repair Plus
- Same-day dispatch when you order before 4pm, Monday to Friday.
- UK stock, shipped from Manchester.
- Every part tested before dispatch.
- 30-day returns.
- Trusted by DIY repairers and independent repair shops.
Frequently asked questions
Why does this battery say 3880mAh when other listings say 4000mAh?
3880mAh is the rated (minimum) capacity for the EB-BG991ABY battery type, while 4000mAh is the typical figure often quoted for the Galaxy S21. They describe the same size of battery.
Will this fit my Galaxy S21 FE?
No. The Galaxy S21 FE (SM-G990B) uses a different battery. This one is for the standard Galaxy S21 5G only.
Is the Galaxy S21 battery hard to replace?
It is a moderate DIY job. The back cover is glued, so you need heat and patience, plus new adhesive to reseal it.
How fast will it arrive?
Orders placed before 4pm, Monday to Friday, are dispatched the same day from our Manchester stock.
