A worn battery in the Samsung Galaxy S23 Ultra 5G 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 S23 Ultra 5G. 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 S23 Ultra 5G 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 S23 Ultra 5G 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
- If we discover water damage during your repair that affects the work, we will stop and let you know. A water damage diagnosis is applicable at the current fee, and we will confirm this with you before we proceed.
- 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 S23 Ultra 5G repairs
- View all Samsung Galaxy S23 Ultra 5G repairs
- Samsung Galaxy S23 Ultra 5G Screen Repair
- View all Samsung repairs
- How our walk-in and mail-in service works
Book your battery replacement
Book your Samsung Galaxy S23 Ultra 5G 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
How do I know if my Samsung Galaxy S23 Ultra 5G 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.