Cadmium-nickel battery charger with discharge first and charge later function composed of LM324

　　This circuit discharges the nickel-cadmium battery before charging to eliminate the "memory" effect, and automatically switches to the charging state after discharging. The charging method is wide modulation constant current , pulsating constant current charging plus pulse discharging. After the battery is fully charged, the voltage at both ends of the battery is detected, and dual control and parallel charging are implemented, with anti-reverse charging function.