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Independent specialist - Harefield, WD3

Repair your hybrid or EV battery. Don't replace it.

High-voltage battery specialist serving Harefield and the surrounding area. Cell-level diagnostics, repair and reconditioning - plus full BMS coding so the fix is recognised by your car. Tesla, BMW, Toyota, Honda and every hybrid or EV.

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Every repair carried out in-house by a qualified electronics specialist.
EV & Hybrid
Coding for 2025+
Battery diagnosis Repaired
Cells tested & balanced OK
Fault codes cleared Done
Repair coded to vehicle Validated

Repaired, not replaced

A fraction of the cost of a full dealer battery.

Every make

Tesla, BMW, Toyota, Honda and more.

Latest 2025+ models

Coding others can't do, done in-house.

Real electronics expertise

Hands-on by a qualified specialist.

What we do

Hybrid & EV battery work, end to end

From the first warning light to a fully validated repair - diagnosed, repaired and coded under one roof.

01

Hybrid battery repair

Failing cells and modules tested, balanced, reconditioned or replaced - so your hybrid holds charge again and the warning light goes out.

Learn more 02

EV battery repair

High-voltage pack diagnostics and cell-level repair for fully electric cars. We find and fix the fault rather than condemning the whole pack.

Learn more 03

Diagnostics & health check

Range loss, warning lights or a no-start? A full battery and BMS health report tells you exactly what has failed and what it takes to fix.

Learn more 04

BMS & ECU coding

We code the repair into your car so it validates the battery, clears the fault and runs as designed - including 2025+ models that reject anything uncoded.

Learn more
The difference

Most garages can't code a battery repair. We can.

Newer hybrids and EVs - think 2025 BMWs - won't simply accept a repaired or replaced battery. The car's software has to be coded to recognise the work, or it rejects the pack and keeps the warning light on.

DM Electronics does that coding in-house, at the battery-management and ECU level, so your repair is registered as genuine and the car drives exactly as it should.

  • Repairs hardcoded and validated to your vehicle
  • Battery faults cleared properly at BMS / ECU level
  • Works on the newest models other shops turn away
How coding works
dm-electronics // bms-coding session
> reading high-voltage battery state ....... OK
> module 7 repaired - registering new cell group
> writing battery data to vehicle ECU .. done
> clearing fault P0AFA / hybrid battery .. cleared
> calibrating state-of-charge ....... OK
> validating pack against vehicle ..
PACK VALIDATED - recognised by vehicle
Makes we work on

If it has a hybrid or high-voltage battery, we can help

TeslaBMWToyotaHondaLexusNissanHyundaiKiaAudiMercedes-BenzVolkswagenVolvoMGRenaultMitsubishi+ any hybrid or EV
How it works

From warning light to back on the road

1

Get in touch

Call or WhatsApp with your car, year and the symptoms you are seeing.

2

Diagnosis

We test the battery and BMS and give you a clear, honest report and price.

3

Repair

Cell-level repair, reconditioning or module replacement - carried out in-house.

4

Coded & returned

We validate the repair to your car so it runs exactly as it should.

Questions

Common questions

Is repairing my battery cheaper than replacing it?
Almost always. A main-dealer battery replacement can run into thousands of pounds, but in most cases only certain cells or modules have actually failed. We repair those, so you pay a fraction of the cost of a brand-new pack.
Which makes and models do you work on?
Every hybrid and EV - Tesla, BMW, Toyota, Honda and the rest. If it has a hybrid or high-voltage battery, get in touch.
My car is a 2025 model. Can you still help?
Yes. The newest models need the repair coded into the vehicle before it will be accepted - we do that hardcoding in-house at the BMS and ECU level, which is exactly what many garages cannot do.
What if only part of my battery has failed?
That is the most common case. We identify the specific faulty cells or modules and repair or replace just those, rather than condemning a whole pack that is mostly healthy.
Where are you based?
The Old Quarry, Springwell Lane, Harefield, Rickmansworth WD3 8UX - serving Harefield, Rickmansworth, Uxbridge, Watford, Northwood, Denham and the surrounding area.

Warning light on? Lost range? Quoted for a whole new battery?

Talk to a specialist before you spend thousands. Most hybrid and EV batteries can be repaired - and coded so the fix actually holds.

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