Abstract: An auxiliary power supply includes a battery, a motor-generator and an inertial energy storage mass. The motor-generator draws power from the inertial energy storage mass to drive the motor-generator thereby creating electricity. As inertial energy is depleted from the drive mechanism during use, a battery recharges the inertial energy storage mass. The inertial energy storage mass includes a series of flywheels each having smaller disks contained therein. The disks translate radially with respect to the flywheels working with gravity to provide drive power to the motor-generator.