The Noco Genius is a portable automatic battery charger and maintainer for lead-acid and lithium-ion batteries. Designed for charging a Motorcycle, ATV, Snowmobile, Personal Watercraft, Lawn Mower and much more. It also can be used as a battery maintainer to keep a Car, Boat, RV, and deep-cycle batteries fully charged. And it monitors battery activity for safe and efficient charging without any overcharge and complete with a built-in battery desulfator to rejuvenate underperforming batteries.