Forgot your battery throughout the winter? OptiMate_ 5 voltmatic is the first ever charger capable of automatically recovering 6V lead-acid batteries from deep discharge. OptiMate_ 5 voltmatic the ideal tool with automatic selection for 6V - 12V battery care at home. First charger with multi-stage desulfation recovery for 6V batteries. Fully automatic 6V/12V battery care for medium to large batteries OptiMate_ 5 voltmatic retains all the fully automatic, 100% safe, easy-to-use characteristics 12V battery is optimally recharged, tested and then safely maintained for months at a time. Keeps the battery at 100% without ever over-charging and prolongs battery life by up to 400%.