The LITHIUM US is an advanced microprocessor controlled charger specially designed to recharge and maintain the cells of Lithium-Ion Phosphate batteries while maximizing their performance and lifespan. It is a fully automatic (connect and forget) charger with 8 charging steps. Some of the steps include a testing sequence to show if the battery can take and retain charge, a unique maximization step to restore full capacity, and patented maintenance charging to ensure maximum performance even after months of inactivity.