Advanced 12 V LiFePO4 2.5 - 100 Ah battery charger/maintainer. Extends life and improves performance of a 12 V battery, mounted in a vehicle/craft or battery operated system that is not in daily use, even in temperatures below freezing. Optimate senses the battery condition, recharges and then keeps the battery 100 % ready. The OptiMATE maintenance program delivers only what the battery needs, never overcharges, never undercharges.