Start-Stop

Cars that cut their engine at every red light put the battery through far more starts and partial discharges than an ordinary vehicle. This section gathers EFB and AGM batteries built for that work, each one listed by maker and part number.

Matching the factory technology is the key point: an EFB car takes EFB or AGM, while a car designed around AGM needs AGM again. The tables on every page show the chemistry next to dimensions and polarity.

No products available at the moment

Stay tuned! More products will be shown here as they are added.

Back to Home page

EFB versus AGM in plain words

EFB, short for Enhanced Flooded Battery, is a toughened wet design found in many smaller stop-start models. AGM locks its acid inside glass-fibre separators, copes with deeper cycling and is usual in cars with brake energy recovery or heavy electrical demand. An upgrade to AGM from EFB is generally fine, the reverse is not.

Three things to confirm

The chemistry named on the sticker of the outgoing battery.
Identical case size and post position.
Amp-hours and cranking amps no lower than the factory figures.

Does the car need to be told about the new battery?

Many recent models carry a battery sensor linked to an energy management unit. Until it learns that a fresh battery is in place, it may go on charging for a worn one. A diagnostic tool sorts this in minutes.

My eco-stop has gone quiet. Why?

Automatic stop only engages once the battery reports enough reserve, so an ageing unit, endless short hops or a cold snap can all suspend it. For conventional vehicles browse Car, or explore makers such as Varta and Fulmen.