OptiMate 1 delivers precise micro processor controlled charging and long term maintenance. Maintain any type of 12 volt lead-acid battery without overcharging, filler cap / wet cell, sealed AGM (MF) or GEL. 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. 3-year limited replacement warranty.