Battery Advice
AGM vs EFB Batteries: Which Does Your Car Need?
Both support start-stop. Only one fits your car correctly. Here's how to tell.
6 min read · 21 March 2026
AGM (Absorbent Glass Mat) and EFB (Enhanced Flooded Battery) are both designed for start-stop vehicles. They are not interchangeable — fitting the wrong one will trigger warnings, disable start-stop and shorten battery life dramatically.
When to fit AGM
- Premium and high-electrical-demand vehicles (BMW, Audi, Mercedes, Land Rover)
- Cars with regenerative braking
- Where the OE battery was AGM (check the label)
When to fit EFB
- Entry-level start-stop cars (Ford Fiesta EcoBoost, Vauxhall Corsa, VW Polo)
- Where the OE battery was EFB
Our mobile vans carry both technologies in the correct case sizes for almost every UK vehicle. Enter your registration in our quote form to see which your car needs.