For Samsung Galaxy S21 Ultra 5G G998 Replacement Battery 5000mAh
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Discount applies at checkout on any mix of parts — ideal for repair shops.
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 Ultra 5G 5000mAh replacement battery is a brand new internal battery for the Galaxy S21 Ultra (SM-G998B) 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
- 5000mAh capacity: matched to the large Galaxy S21 Ultra so your phone gets back to a full day of use.
- Direct replacement: same shape and flex connector as the factory cell, so it drops straight into the frame.
- Fixes common battery faults: rapid drain, random restarts, shutting down at 20 to 30 percent and slow charging caused by a worn cell.
- Tested before dispatch: each battery is checked before it leaves our Manchester stockroom.
- Cheaper than a new phone: a battery swap is one of the most cost-effective ways to extend the life of a flagship.
Specifications
| Part | Internal replacement battery |
|---|---|
| Capacity | 5000mAh |
| Compatible model | Samsung Galaxy S21 Ultra 5G (SM-G998B) |
| 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 Ultra 5G (SM-G998B and other G998 variants) only. It does not fit the standard Galaxy S21 (SM-G991B), Galaxy S21 Plus (SM-G996B) 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.
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
Will this battery fit my Galaxy S21 Plus?
No. It is sized for the Galaxy S21 Ultra only. The S21 Plus and standard S21 each need their own battery.
Do I need to remove the screen to change the battery?
No. On the Galaxy S21 Ultra the battery is reached from the back, so you remove the back cover and the internal shields, not the screen.
Why does my new battery show odd percentages at first?
The phone needs a few full charge cycles to learn the new cell. Charge to 100 percent and use it normally and the reading will settle.
How fast will it arrive?
Orders placed before 4pm, Monday to Friday, are dispatched the same day from Manchester.
