Abstract: This disclosure relates to a cycling type of a constant current electronically controlled battery charger having a reactive transformer, a full-wave rectifier, a series regulator and a sensing and control circuit for alternately supplying a low and high charging rate to a rechargeable battery whereby the battery is constantly "worked" in order to prevent accelerated deterioration of the battery.

Abstract: This disclosure relates to an automatic taper charging battery charger having a power transformer and a series connected variable reactor, a pair of rectifiers powered by the transformer, a pair of output terminals coupled to one of the rectifiers, a sensing and control circuit powered by the other rectifier and responsive to the voltage of a battery connected to the output terminals for controlling the impedance of the variable reactor and in turn regulating the voltage developed across the power transformer and thereby controlling the current charging rate supplied to the battery.