Samsung Galaxy S21 Battery Replacement
At a Glance: Repair My Crack provides professional Samsung Galaxy S21 battery replacement with a 12-month warranty, using high-quality replacement batteries tested for charging performance and reliability. We offer same-day Harlow drop-in repairs, local doorstep collection where available, and UK-wide mail-in repair with free tracked Royal Mail postage and £750 transit insurance.
Samsung Galaxy S21 Battery Replacement Price and Booking
Select Battery below to view and book your Galaxy S21 battery replacement. The same booking system also displays other available S21 repairs if your device has more than one fault.
| Item | Price |
|---|---|
| Galaxy S21 Premium Screen | £139.99 |
| Galaxy S21 Standard Screen | Price on request |
| Galaxy S21 Battery | £59.99 |
| Galaxy S21 Charging port | Price on request |
| Galaxy S21 Wireless charging port | Price on request |
| Galaxy S21 Back-facing camera | Price on request |
| Galaxy S21 Front-facing camera | Price on request |
| Galaxy S21 Back cover | £44.99 |
Not sure the battery is the problem? We diagnose every device before carrying out a repair. If we identify a different fault, we’ll contact you before any work is completed.
Common Samsung Galaxy S21 Battery Problems We See
Two issues come up more than any other with Samsung batteries: a phone that’s unexpectedly restarting or freezing, and a swollen battery pushing the back glass or screen away from the frame. Both are worth taking seriously rather than waiting to see if they settle down.
Your S21 keeps rebooting or freezing
If your S21 restarts on its own, freezes randomly, or shuts down while the battery still shows charge, a worn or unstable battery may be responsible. Software faults, overheating, and other hardware problems can cause similar symptoms, so we test the device before confirming that a battery replacement is required.
Your S21 battery drains unusually quickly
A noticeable loss of battery life may be caused by background apps, software settings, or normal battery wear. If your Galaxy S21 continues to drain quickly after checking battery usage, installing updates, and restarting the device, the battery may need to be professionally tested or replaced.
Swollen battery
A swollen battery usually shows up as the back glass lifting, bulging, or separating slightly from the frame, or the screen pushing up at the edges. This is the one battery symptom we’d ask you to act on immediately rather than wait — stop using and stop charging the phone straight away if you notice any swelling, and get it looked at as soon as possible. It’s a safety issue, not just a performance one.
Checking Your Samsung S21’s Battery Health
Go to Settings → Battery and device care → Battery to review recent usage patterns and charging history. Samsung doesn’t display a precise battery health percentage on most models, so this menu is useful context rather than a definitive diagnosis — sudden changes in usage, unusually slow charging, or on-screen warnings are the things worth paying attention to.
The Replacement Process
- Book online — select Samsung Galaxy S21 and Battery above.
- Send or drop off your phone — post using free tracked postage, or drop it in at our Harlow workshop. See our full mail-in repair process for details.
- Battery tested and replaced — checked for charging speed, health reporting, and overall performance before it goes back out.
- Returned safely — tracked delivery, insured in transit up to £750.
In most cases, diagnostics and the battery replacement itself are completed the same day your S21 arrives with us, though this can vary slightly depending on workshop volume.
Why Choose Repair My Crack?
- Professional diagnosis — we check the device before confirming that battery replacement is the correct repair.
- Your data normally remains untouched — battery replacement does not usually require personal data to be accessed or erased, although we recommend backing up beforehand.
- 12-month warranty on eligible repairs.
- Free tracked Royal Mail postage both ways for UK mail-in repairs.
- Harlow drop-in appointments and local collection where available.
- Fast turnaround — most battery replacements are completed on the same working day the device arrives, subject to diagnosis and parts availability.
Frequently Asked Questions
How much does a Samsung Galaxy S21 battery replacement cost?
The current Samsung Galaxy S21 battery replacement price is displayed in the booking section above, and includes fitting, testing, and our 12-month warranty.
My S21 keeps restarting itself — is that the battery?
It could be. A worn or unstable battery can cause unexpected shutdowns and restarts, but software and other hardware faults can produce similar symptoms. We diagnose the device before replacing the battery.
Is it safe to keep using a swollen battery?
No. Stop using and stop charging the phone straight away if you notice swelling, and get it looked at as soon as possible.
How long does a Samsung S21 battery replacement take?
In most cases, the replacement is completed the same day your S21 arrives with us. Including free tracked postage both ways, most customers have their phone back within 2–4 days.
Will replacing the battery affect the data on my phone?
A battery replacement does not usually require us to access or erase your personal data, but as with any repair, we’d always recommend backing up beforehand as good practice.
Can I get my screen fixed at the same time?
Yes — select Screen alongside Battery above, or add it at checkout.
Is my Samsung S21 insured while it’s with you?
Yes, your S21 is insured up to £750 in transit.