A battery for a start-stop car — why AGM/EFB

A start-stop system switches the engine off when stationary and starts it again when pulling away. For the battery that means hundreds of extra cycles a day — a load an ordinary flooded battery won’t withstand.

Why not an ordinary battery

In a start-stop car the battery works almost non-stop: it starts the engine every moment and is recharged, including from braking energy recovery. An ordinary flooded battery will wear out quickly in these conditions. That’s why reinforced EFB and AGM types are used.

• Basic start-stop — an EFB battery
• Extensive start-stop with regeneration — an AGM battery
• An ordinary flooded one — rapid capacity loss and function failure
• The type and parameters must meet the manufacturer’s requirements

Registering and adapting the new battery

In many start-stop cars the new battery has to be registered in the on-board computer. Without that the charging system treats the new battery as an old one, which shortens its life and can switch off the start-stop function.

In a start-stop car the battery isn’t just a “starter” — it’s part of a system that often needs registering after a change.

Selection and replacement

The key thing is choosing the right type and parameters compliant with the car’s specification. We’ll select a suitable AGM or EFB battery, replace it with call-out and, if needed, register it in the car.