Introduction of 5-stage mode:
no-load mode: when there has no load connected with charger, the led screen will show voltage only, the power is about 2w;
constant current mode: means the battery voltage is lower than the set voltage of charger, then the charger supply constant charging current to maintenance both battery and battery charger;
constant voltage mode: advanced pulse width modulation (pwm) technology, control the chargers current and output voltage accurate, avoid overcharge;