System and method are provided for transferring electrical energy among multiple electrical energy storage devices via a differential power bus and a capacitive load switched-mode power supply. The switched-mode power supply transfers the electrical energy between the load capacitor and the differential power bus to which the electrical energy storage devices (e.g., rechargeable batteries and/or capacitors connected in parallel or series or combinations of both) are electrically connected via bus switches. As a result, electrical energy is efficiently transferred and distributed among the electrical energy storage devices.