The battery charger is a fully automatic three-stage charging AC to DC charger. Using high-frequency PWM pulse width modulation technology, it is a switching power supply automatic charger composed of IGBT power tube and pulse width modulation integrated controller as the main components. It mainly provides charging for the battery. Automatic three-stage charging, LED displays different charging status. Commonly used ones include 12V and 24V car battery charger series. An external temperature sensor is optional and if a car battery charger is used it will adjust the bulk charge and float voltages based on the temperature of the battery type.