Abstract: A battery charging method for charging a battery such as a lead acid storage battery quickly, and a battery charging apparatus used in carrying out the battery charging method, includes an initial charging process between times 0 to t1, a quick charging process between times t1 to t2 and a final charging process between times t2 to t3, carried out step-wise and continuously. In the initial charging process, a charging current whose volume of electricity is increased gradually is applied. In the quick charging process, a charging current whose volume of electricity is larger than the initial charging process is applied intermittently to a battery while watching a voltage. In the final charging process, a charging current whose volume of electricity is reduced gradually is applied to the battery when the voltage has reached a charge-end voltage. Thereby, it is possible to charge in a very short time, and to penetrate the charging into electrodes without damaging the battery.