The LITHIUM US (CTEK Part No. 56-926) is an advanced microprocessor-controlled charger specially designed to recharge and maintain the cells of Lithium-Iron (LiFePO4) batteries – maximizing their performance and lifespan. With up to 4.3A of charge current available the LITHIUM US is extremely flexible and will charge LiFePO4 batteries from 5Ah to 60Ah and maintain up to 120Ah.