This two-bank battery charger maintainer rated a 4-amps – 2-amps per bank – is designed to charge and maintain multiple vehicles like cars, motorcycles, boats, ATVs, RVs, lawn mowers, lawn tractors, trucks, and more. Designed for 6-volt and 12-volt lead-acid automotive, marine, and deep-cycle batteries, including flooded, gel, AGM, and maintenance-free, plus lithium-ion batteries. An integrated thermal sensor detects the ambient temperature and alters the charge to eliminate over-charging in hot climates and under-charging in cold climates. Charges batteries as low as 1-volt. Or use the all-new force mode that allows you to take control and manually begin charging dead batteries down to zero volts. Automatically detects battery sulfation and acid stratification to restore lost battery performance for stronger engine starts and extended battery life. It’s not just a trickle charger, it’s an advanced battery maintainer. A fully-automatic, worry-free battery charger for everyday use – 24/7 – with zero overcharge.