Abstract: In a secondary cell which generates a direct current when the positive electrode complex and the negative electrode complex thereof conduct a reversible redox reaction in the presence of an electrolyte, the positive electrode complex and the negative electrode complex are in a combination (represented by positive electrode complex/negative electrode complex) selected from the group consisting of lead/chromium complex, chromium complex/aluminum complex, and manganese complex/zinc complex. The secondary cell has relatively high capacitance and can be manufactured at low cost. Moreover, it provides more stable chemical reactions and can therefore be stably charged/discharged with large current and without risk of explosion.

Abstract: A dual function motor/generator includes a rechargeable battery, a mode switching device, a dual function rotor/stator structure, at least two transmission devices and a clutch device for selecting one of the two transmission devices depending on whether a motor or generator mode is selected. When the dual function motor/generator is used as a motor, power is supplied from the rechargeable battery controlled by the mode switching device to a driven load through the rotor/stator structure and one of the transmission devices, and when used as a generator, the battery is recharged by applying an external force to the load such that the load drives the other transmission device to rotate the rotor in a direction opposite a direction of rotation of the rotor in the motor mode, and thereby induce an electric current in the rotor/stator structure to recharge the battery.

Abstract: A self-rechargeable telephone having includes a power generation device capable of converting mechanical energy into electric energy and storing the electric energy in a battery cell. The direct-current voltage generated by the power generation device is obtained by reciprocally moving the magnetic body inside the coil winding to induce electric energy in the coil, and by then rectifying the electric energy.

Abstract: This invention relates to an apparatus for self-generating a driving force, which employs an electromotive force generated on a coil by an electromagnetic induction, in combination with a mechanical driving device to drive a rotating shaft of the device, such that the rotating shaft can rotate continuously without any external power after an initial activation. The apparatus comprises a mechanical driving device, at least two coils, wherein the mechanical driving device includes arms in attachment with magnetic bodies, thereby an opposite electromotive force can be generated based on an electromagnetic induction to apply a force on the magnetic bodies for a rotation of the shaft.