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The High Efficiency Wall Mount Battery Maintainer from Extreme Max is the perfect way to keep your batteries fully charged and maintained while featuring three modes of operation. Bulk Mode offers full charge strength for low charged batteries, Absorption Mode provides a high constant voltage for mostly charged batteries, and Storage Mode maintains a low constant voltage for fully charged batteries. Charge time depends on both battery size and condition of the battery. Normal 15 Amp-hour batteries take approximately 9 hours to get to 80%, while a large vehicle battery may take multiple days to reach a high charge. AC Input Voltage: 120V AC, Frequency: 60Hz, AC Input Current: 0.25 Amp, DC Output Voltage: 12V Nominal, DC Output Current: 0.75 (Maximum).