The G4 is a 4-bank automatic battery charger and maintainer for both 6V and 12V lead-acid and lithium-ion batteries. It's capable of charging up to four different batteries at the same time, and perfect for charging a motorcycle, ATV, snowmobile, personal watercraft, lawnmower, and much more. It also can be used as a battery maintainer to keep a car, boat, RV, and deep-cycle batteries fully charged. It monitors battery activity for safe and efficient charging without any overcharge, and features a built-in battery desulfator to rejuvenate underperforming batteries.