- After payment, we order this part specifically for your repair.
- It usually arrives within 1 working day.
- We contact you the same day it arrives to book your fitting.
A worn battery in the Samsung Galaxy S8 can cause rapid drain, unexpected shutdowns, excess heat or a phone that only works reliably while connected to power. We replace the battery, check charging behaviour and test the main functions before return.
Repair options
This service uses a quality OEM-compatible replacement battery matched to the Samsung Galaxy S8. The part is ordered specifically for the repair and normally arrives in 1 working day. Once it arrives, we contact you to arrange the fitting.
Signs your Samsung Galaxy S8 needs a new battery
- The charge falls much faster than it used to
- The phone shuts down while charge is still showing
- The battery percentage jumps or behaves unpredictably
- The device becomes unusually warm during normal use
- The screen or rear panel is lifting because the battery may be swollen
What is included
- Careful removal of the worn battery
- Fitting of a model-matched OEM-compatible replacement
- Charging and power-stability testing
- Function checks before collection or return
- 6-month repair warranty
Confirm your model
Please check the model name in Settings or bring the phone to us for confirmation. We verify that the device is the Samsung Galaxy S8 before ordering the battery or starting work.
Repair process
- Book the repair online or visit us near Liverpool Street Station.
- Choose walk-in or UK mail-in and provide the device details.
- We order the correct battery and contact you when it arrives.
- The battery is fitted, the phone is tested and the repair is covered for 6 months.
- Collect the device or receive it by tracked return delivery.
Why choose Square Repair
- Independent repair specialists established in 2015
- Workshop near Liverpool Street Station
- Walk-in and UK mail-in service
- Clear testing before the device is returned
- Your data normally remains untouched during a battery replacement
Before you book
- Stop charging the phone if the screen or back is lifting, as the battery may be swollen.
- A battery replacement will not resolve charging-port, liquid-damage or board faults.
- If the phone is completely dead, we may need to confirm the cause before fitting the battery.
- Please back up important data where possible before any repair.
Related Samsung Galaxy S8 repairs
- View all Samsung Galaxy S8 repairs
- Samsung Galaxy S8 Screen Repair
- View all Samsung repairs
- How our walk-in and mail-in service works
Book your battery replacement
Book your Samsung Galaxy S8 battery replacement for a walk-in visit near Liverpool Street Station. For repairs from elsewhere in the UK, see how to use our mail-in service.
Frequently Asked Questions
Do you recycle the old battery?
Yes, the old cell is disposed of responsibly.
Can I walk in or post it?
Both. Walk in near Liverpool Street Station or post it with tracked return.
How long does it take?
Often the same day where the cell is in stock. We confirm at booking.
How do I know the battery is the problem?
Fast drain, early shutdowns, only running on the charger or a swelling cell are the usual signs. We confirm before any work.
What should I do if the battery looks swollen?
Stop charging it and book promptly. A swollen cell can push on the screen or frame.
Will I lose my data during a battery replacement?
No. It is a hardware-only procedure and your data stays exactly as it is.