The Genius5 is a portable and automatic battery charger. It can be used for both 6V and 12V lead-acid and 12V lithium-ion batteries. The Genius5 is designed for charging cars boats RVs SUVs diesel trucks motorcycles ATVs snowmobiles personal watercraft lawn mowers and much more. It can be used as a battery maintainer to keep both starter and deep-cycle batteries fully charged. It also monitors battery activity for safe and efficient charging without any overcharge. The Genius5 is complete with a built-in battery desulfator in order to rejuvenate underperforming batteries.