Abstract: A portable, light-weight, electrically powered device that derives at least part of its power from manual mechanical input means having a rotatively mounted battery which provides electrical power but also acts as an mechanical inertial storage mechanism. The kinetic energy of the moving battery is capable of being utilized via a generator to energize the device's electrically powered element. In one embodiment, a compact high-output generator is disclosed for providing increased current over a given time period for recharging the battery. In another embodiment a rotatively mounted canister is provided for mounting one or more batteries or other variable mass materials if generator power is used exclusively. Manual input occurs via enclosed gear-based hand levers.