Vehicles that use Start-Stop systems need batteries that can handle many start and charge cycles. VARTA says that EFB and AGM are the battery technologies that work best for Start-Stop applications. VARTA also says that if an AGM battery needs to be replaced it should be replaced with another AGM battery. Kelvin Battery offers Varta Battery replacement help. Can show motorists how to find a suitable replacement that matches their vehicle’s battery needs and specs.