The PowerMax PM4-15LK Converter/Charger converts 120V AC to 12V DC to fully charge and maintain any battery type, while providing clean DC power for 12V equipment. The PM4-15LK features a built-in 15 Amp automatic 4-stage smart charger with the ability to manually adjust the charging voltage for different battery types including AGM, Lead Acid and Lithium. It can also function as a power supply with its adjustable fixed output mode, which can be set between 13.0 and 16.5 VDC.