EV & Hybrid High-Voltage Battery Work in Sunbury-on-Thames
A high-voltage battery warning doesn’t automatically mean the whole battery needs replacing. Faults can be in cooling, sensors, contactors or individual modules.
We diagnose high-voltage battery systems and carry out removal, replacement and battery-related repair work where appropriate.
Common signs
Symptoms worth checking
- High-voltage battery warnings
- Reduced range
- Charging faults
- Reduced power
Diagnose before replacing
We review cell and module data, isolation measurements, cooling performance and fault history to understand the problem.
Removal and replacement require trained technicians, insulated tooling and safe procedures.
What we check
- Battery management data
- Isolation testing
- Cooling circuit
- Contactors and connections
What we can do
- HV battery diagnostics
- Battery removal and replacement
- Battery-related repairs where appropriate
How it works
The process
- 01
Diagnose.
- 02
Explain options.
- 03
Carry out work safely.
- 04
Verify and clear faults.
Why The Factory
Main-dealer capability, independent service
A Master Technician-led workshop with seven mechanical ramps, a dedicated MOT ramp and dealer-level diagnostics. Faults are shown to you and additional work is quoted before it goes ahead.
We stand behind the work we carry out. Parts and workmanship are covered in accordance with your statutory rights and any applicable manufacturer or supplier warranty. Please ask us for details relevant to your repair.
- Qualified high-voltage technicians
- Battery lifting equipment
Courtesy cars
Courtesy cars are available, subject to availability.
FAQs
High-Voltage Battery Work: your questions answered
What are the signs of a high-voltage battery problem?
Warnings, reduced range, charging problems or reduced power.
Can you remove and replace high-voltage batteries?
Yes.
Do high-voltage systems require specially trained technicians?
Yes, and our team is trained and qualified.
Does every battery warning mean the entire battery needs replacing?
No. Many faults are in sensors, cooling or connections.
Can you diagnose the battery before recommending replacement?
Yes — always.
Related services
EV & Hybrid
High-voltage servicing and repair.
EV Servicing & Repairs
Electric vehicle servicing, diagnostics and repair.
Hybrid Servicing & Repairs
Hybrid servicing and repair by qualified high-voltage technicians.
Vehicle Diagnostics
Dealer-level fault finding — not just reading and clearing codes.
Need help with high-voltage battery work?
Send your registration and a quick description on WhatsApp, or call the workshop.
The Factory, Harris Way, Sunbury-on-Thames TW16 7EL