The disclosed battery management system generally includes at least one bi-directional balancing circuit and a power supply including a first battery module and a second battery module, each having at least one battery cell. The balancing circuit may be configured to transfer excess charge from one or more battery cells of the first battery module to one or more battery cells of the second battery module. By redistributing the level of charge within one or more battery cells, the balancing circuit can cause the overall charge of a power supply to last longer by taking advantage of excess charge found within one or more battery cells. Additionally, the balancing circuit may be connected to a bus bar that may be utilized to power additional accessories within a vehicle.