The Expion360 DC to DC Mobile Charger is designed to charge Lithium Iron Phosphate (LiFePO4/LFP) chemistry deep-cycle batteries from the vehicle's alternator via the chassis battery. The mobile charger is unique in that it uses a constant current (CC) 2-stage constant voltage (CV) charge profile at 14.6V/25A. The charger is compact, easy to install and easy to use. The Mobile Charger is specifically designed to charge Expion360 VPR 4EVER Classic and Platinum batteries. It can also be used with other LFP chemistry batteries that recommend the same charge profile.