Abstract: A generator assembly for converting human generated mechanical energy into electrical power for charging at least one rechargeable device is provided herein. The generator assembly generally includes a housing, a primary gear supported within the housing, an input mechanism mounted to the primary gear for receiving the human generated mechanical energy, an alternator for converting the mechanical energy converting the mechanical energy into electrical power, and a charging mechanism mounted to the housing with the charging mechanism directly connected to the alternator, where the charging mechanism has at least one rechargeable interface for transferring the electrical power to the rechargeable device. A method of charging at least one rechargeable device with a generator assembly and a method of authorizing use of a generator assembly are also provided.