The GENIUS2 is a portable 6-volt and 12-volt battery charger, battery maintainer, trickle charger, and battery desulfator rated at 2-amp for lead-acid automotive, marine, and deep-cycle batteries, including flooded, gel, AGM, SLA, and maintenance-free, plus lithium-ion batteries. A fully-automatic, worry-free smart battery float charger for everyday use - 24/7 - with zero overcharge. It is compatible with all types of vehicles, including cars, autos, motorcycles, scooters, lawnmowers, ATVs, UTVs, lawn tractors, trucks, SUVs, boats, jet skis, RVs, classic cars, and more.