The OptiMate 1 Duo features a precise microprocessor controlled charging and long-term maintenance. Maintain any type of 12 volt lead-acid battery, filler cap / wet cell, sealed AGM (MF) or GEL and 12.8/13.2V lithium (LiFePO4) batteries without overcharging. Ideal for vehicles that are seldom or seasonally used, or in storage. The OptiMate maintenance program delivers only what the battery needs, never overcharges, never undercharges. Learn More