Batter life extender used for lead-acid storage cell

The present invention provides a battery life extension device, connecting in series with the battery in a current circuit, including an intelligent switch, a voltage stabilizing circuit, a frequencyconversion inverter circuit, a pulse circuit and an energy saving timer of the circuit connection in turns, maintaining self activity by utilizing battery self energy. The battery life extension device of the invention is capable of making the battery active, increase of service life, improving charge efficiency, reducing charge power and saving charge energy.