Improvements in a high frequency multiphase flyback power supply for battery charging and power supplies used in devices that provide de-sulfation capability to the batteries. The system utilizes a high efficiency, multiphase array flyback battery charger or power supply, with a localized or Internet based bi-directional communication means to monitor and optimize battery charging. The de-sulfating current can be a variable, or harmonic, repeating patterns of ON and OFF pulses which may be applied to the battery at an operator-adjustable peak amperage of about 0-350 amps. The de-sulfation process before, during or after the normal battery charging cycle, or any combination thereof. The temperature of the battery and the specific gravity of the fluid within the battery is measure during the de-sulfating process. The connection to the internet allows the processes to be monitored at a distance from where the charging is taking place.