DUAL BATTERY CHARGING SYSTEM AND A METHOD OF USE THEREOF

A system and method for managing and controlling the charging and discharging of dual batteries in a vehicle, wherein the auxiliary battery is a lithium-ion battery, and the primary battery can be of any type. The system includes a charging circuitry for charging the lithium-ion batteries using power from the power supply of the vehicle. The system further includes a controller that prioritizes the charging of the primary battery. The controller allows simultaneous charging of the primary battery and the secondary battery when the charging status of the primary between is about 13.5 Volts and prevents charging of the secondary battery when the voltage source is below 13.2 Volts.