Cadmium nickel battery discharger circuit

Relevant key device information applied in this article: The biggest disadvantage of BC639 cadmium-nickel battery is the memory effect. An effective method to eliminate the memory effect is: clean the cadmium before every third or fourth charge of the cadmium-nickel battery. The nickel battery is completely discharged once, that is, the nickel-cadmium battery is charged when the voltage of a single-cell nickel-cadmium battery drops to 0.75V. This method can restore the capacity of the nickel-cadmium battery in time to ensure normal use, but the termination of each discharge The voltage of each nickel-cadmium battery must not be lower than 0.65V, otherwise the nickel-cadmium battery will be damaged due to polarity reversal due to over-discharge. The nickel-cadmium battery discharger circuit is shown in the figure below