Service · Stop-start system
Start-Stop Battery Replacement Service
Stop-start not working? Correct AGM or EFB replacement with BMS coding, on your driveway across the West Midlands.
Every stop-start car needs a specific battery type — AGM or EFB depending on the manufacturer — and a specific coding step to register the new battery to the vehicle's Battery Management System.
Skip either and stop-start will refuse to engage, or the new battery will fail early. We do both correctly on the driveway.
Who calls us for this
Drivers of any petrol or diesel from ~2012 onwards where stop-start has stopped working.
What we actually see on these jobs
- Fitting a standard flooded battery instead of AGM/EFB is the top cause of repeat failure we see.
- BMS coding is not optional — the alternator field voltage stays wrong until it's done.
- Stop-start re-engagement is verified as part of every fit before we take payment.
Key facts — Start-stop battery service
- System
- Stop-start / auto-start-stop / ISG
- Battery types
- AGM (premium) or EFB (entry level)
- Coding
- OBD-level BMS registration — mandatory
- Verification
- We check stop-start re-engages before leaving
Start-stop battery service — specific questions
Q.How do I know if my car has AGM or EFB?
The battery label says. If it's already gone, we look up the correct spec by reg — we won't guess.
Q.Will stop-start work immediately after replacement?
Usually within a short drive as the BMS re-learns. It should re-engage the same day.
Q.Do I need to go to a dealer for the coding?
No — we do OBD-level coding for BMW, Audi, VW, Mercedes, Ford, Vauxhall, PSA on the driveway.
Our four-step process
- 1
Fixed quote
By postcode and reg, before we move.
- 2
Load test
So we're not selling you a battery you don't need.
- 3
Correct spec
AGM, EFB or standard flooded — matched to your car, not what's cheapest.
- 4
Coded & clean
BMS registered, terminals greased, old unit recycled.
Related guides
General questions
Q.What warranty comes with a new battery?
Tier-1 batteries with 2–4 year warranty depending on chemistry (standard flooded, EFB or AGM). Warranty is transferable and registered on the day.
Q.Are you insured?
Yes — fully insured with public liability and goods-in-transit on every callout and every battery we fit.
Q.What payment methods do you accept?
Card, contactless, Apple Pay and Google Pay on the driveway. Bank transfer accepted for accounts. No cash-only surprises.
In short
Stop-start systems need exact-spec batteries plus coding. That's the whole job — and that's what we do.
Stop-start failing? Correct battery, coded, verified working.
AGM or EFB per spec, BMS coding, stop-start reset — one visit.
Stranded with a flat battery?
Call now or send a WhatsApp — we'll confirm your quote and dispatch the nearest engineer.