This is a charger for 15-series LiFP battery packs, nominally 48V (15 x 3.2V), which charges at 54.8volts (15 x 3.65V). The bulk charge current is 1500 mA. It is a multi-stage li-iron LiFePO4 recharger with universal AC input. Includes a slow start feature and a 4-segment fuel gauge. These are state-of-the-art battery chargers that can be used on-demand, or left permanently on the battery for maintenance. The slow-start function helps battery cycle life, especially with deeply discharged batteries. The charger is fully isolated from the mains, has universal AC input, and a removable AC cord. Will accurately charge lithium-iron-phosphate packs.