This paper presents a method of sulfate reduction of lead-acid batteries using high-frequency pulses. It is a suitable electronic circuit that is attached in parallel to the two electrodes of each battery to continuously generate a high-frequency pulse with dif- ferent duty cycle lengths. Experimental results show that charging a lead-acid battery with a high-frequency pulse gives very posi- tive results, which are that the internal resistance of the battery is signifi cantly reduced and the capacity is increased. Besides, the microcontroller-based system with sensors also allows to monitor of the temperature of the battery case and stops the function of the automatic pulse generator before reaching the failure threshold to protect and prolong the life of the battery.