027 car batteries are produced in traditional WET, EFB and AGM technology types. Wet batteries are used on cars that are not fitted with start-stop technology (where the engine stops itself at junctions). EFB batteries are used on standard vehicles that are fitted with stop-start (Vauxhall, Ford etc). AGM batteries are fitted to premium vehicles fitted with start-stop tech (Range Rover, BMW, Audi etc). Please answer the question below to determine the correct battery for your vehicle.