BatteryMINDer solar chargers actively monitor your battery\'s voltage any time the sun is up. These solar battery charges will optimize all solar panel charge rates. Patented high frequency PulseMode desulfation circuitry, designed to safely reverse and eliminate battery sulfation, the #1 cause of early battery failure. The internal program adjusts its output several times a second based on this reading to quickly and correctly charge your battery. When used as a maintainer, the BatteryMINDer is guaranteed to maximize your battery’s life and storage capacity.