Abstract: The present disclosure is a method and apparatus to communicate and convert the electrical power from an EVSE station to a voltage level that an extra low voltage battery on an EV or other similar type of equipment may use to effectively, efficiently, quickly, and safely charge its batteries. The apparatus may be located within or exterior to the electrical equipment which includes extra low voltage batteries. The apparatus may include a power converter and a communication translator. The power converter may be configured to convert electrical power from the EVSE station to a suitable voltage level and current level provided to the extra low voltage batteries. The communication translator may be configured for communicating with the EVSE station and the extra low voltage batteries in order to determine the suitable voltage level and current level to be provided to the extra low voltage batteries.

Abstract: The present invention is a control system for charging a lead-acid battery based on the knowledge of the state of charge of the battery to provide a more consistent percent return target across the range of discharge levels and life of the battery.