The Optimate 7 Select is the best option for charging and maintaining your vehicle's more powerful battery. It automatically charges, tests and maintains your battery, adapting to ambient temperatures. For any size of 12V AGM, GEL, EFB or STD starter or deep cycle battery. Can deliver 13.6V 8 amp DC current for vehicle diagnosis and troubleshooting. Rescues completely dead sulphated batteries from 0.5V - The most advanced recovery programme! By choosing Optimate, you ensure your battery lasts longer, good for your wallet and the environment!