Powerful, energy efficient and compact. A two bank battery trickle charger with 4 amps. - 2 Amps per bank - to simultaneously charge and maintain multiple batteries of vehicles such as cars, motorcycles, boats, ATVs, RVs, lawn mowers, lawn tractors, trucks and more. Built-in temperature sensor detects ambient temperature and adjusts charge to prevent overcharging in hot climates and undercharging in cold climates. Automatically detects battery sulfation and acid stratification to restore lost battery power to extend battery life.