OptiMate 7 Ampmatic SILVER series: 9-step 12V 10A sealed battery saving charger & maintainer.. The smartest fully automatic battery charger for the 12V lead-acid battery in your motorcycle, car / pick-up, boat or camper, the easy-to-use all-rounder that adapts to your battery!. Ideal for 12V engine start (SLI) & deep cycle lead-acid batteries.. Fully automatic multi-step program brings the battery safely to full charge. Connect to the battery and OptiMate 7 Ampmatic does the rest, no supervision required!. AMPMATIC: Automatically adjusts current to match battery size and condition.. Temperature compensation: Voltage is adjusted higher when colder, or lower when hotter.. Safe to leave connected. Full electronic protection.. Maintains battery at full charge and good health.. Saves your ‘dead’ battery from as low as 0.5V.. S.O.H.: Tests battery state of health.. Green Technology: Energy saving technology. Stand-by power less than 0.5W and Efficient 24-7 battery maintenance.. IP54: Weatherproof. Rated for use down to -40°C / -40°F..