4 Hour Charging @ 14.3 VDC Lithium Battery Optimum Charging Module 13.9 Float Mode Maintaining Full ChargeCompatible with: 8300 Series; 5300 Series; 4400 Series; 5400 Series; 5345RU; 6345RU; 7345RU; 7355RUAssembled in North America using US SteelEasy Installation