Samsung Galaxy S9 Battery Replacement
If your Samsung Galaxy S9 no longer lasts the day, shuts down early or feels warm on charge, the battery has usually degraded. Replacing it is one of the most cost-effective ways to extend the life of the phone. We fit and test the battery at our workshop near Liverpool Street Station in London, or you can use our UK-wide mail-in service.
- Turnaround: 1 working day pre-order, with fitting normally completed the same day once the part is available
- 6-month warranty on the replacement battery
- Walk-in near Liverpool Street Station or use our UK mail-in service
Signs your Samsung Galaxy S9 battery may need replacing
- Battery draining significantly faster than it used to
- Phone shutting down unexpectedly, particularly at lower percentages
- Only running reliably while connected to power
- Battery percentage dropping suddenly or jumping around
- Phone getting warm during normal use or charging
- Screen or back cover lifting slightly, which can indicate a swollen battery, book as soon as possible
What is included
- Careful opening and safe removal of the existing battery
- Fitting of a quality replacement battery
- Post-repair USB-C charging and power stability checks
- Full function test before the phone is returned
- 6-month warranty on the replacement battery
How to confirm your model
Go to Settings, About phone, Model number to confirm you have the Samsung Galaxy S9. If you are unsure, bring the phone in and we will confirm before any work starts. The Samsung Galaxy S9 charges over USB-C.
Our repair process
- Book or drop in: Book online or visit us near Liverpool Street Station. Mail-in customers can post their phone from anywhere in the UK.
- Assessment: We inspect the phone before starting and tell you if we find anything unexpected.
- Battery replacement: We remove the old battery safely, fit the new one and reseal the phone carefully.
- Testing: Power, charging and core functions are checked before return.
- Collect or return post: Pick up in store or we return your phone by secure tracked post.
Why choose Square Repair?
- Independent repair specialists near Liverpool Street, working on Samsung phones since 2015
- 6-month warranty on every battery replacement
- No data loss, battery replacement is a hardware-only procedure
- Every repair is tested before handover
- Transparent pricing with no hidden charges
Before you book
- If the screen or back is lifting, treat it as urgent. A swollen battery can damage other parts, so stop charging the phone
- If there has been liquid exposure, a battery alone may not resolve every fault. We confirm our findings before proceeding
- If the phone is completely dead, we carry out a diagnosis before confirming the repair
Related Samsung Galaxy S9 repairs
- Samsung Galaxy S9 screen repair
- Samsung Galaxy S9 charging port repair
- Samsung Galaxy S9 rear camera repair
- How our repair service works
Book your repair
Walk-ins are welcome during opening hours near Liverpool Street Station. For mail-in repairs, place your order online so we can track your phone from arrival. Questions about a battery replacement for your Samsung Galaxy S9? Contact us and we will help.
Frequently Asked Questions
How do I know if my Samsung Galaxy S9 battery needs replacing?
Common signs include fast battery drain, sudden shutdowns, inconsistent percentage readings, overheating or the phone only working reliably while connected to power.
Will I lose my data during battery replacement?
No. Battery replacement is a hardware repair and does not normally affect your data. We still recommend backing up important data before any repair.
How long does the battery repair take?
The battery is normally sourced to order with a 1 working day pre-order lead time. Once the part is available, fitting and testing are usually completed the same day.
Do you test the phone after fitting the battery?
Yes. We test charging, power stability and core functions before returning the device.
What warranty is included?
Samsung battery replacements include a 6-month warranty covering the fitted battery and our workmanship.