The BatteryMINDer Plus Battery Charger/Trickle Charger/Desulfator is an 8-stage maintenance charger/desulfator that extends performance and life of all types and sizes of 12 Volt lead acid batteries, including all starter, deep cycle, maintenance-free, sealed AGM or flooded batteries, regardless of size or make. The Model 12117TC automatically dissolves harmful power-robbing sulfation using safe, low voltage, patented high-frequency pulse technology. UL listed.