How to use the car battery charger:
1. Turn off the engine first, then remove the battery from the car, find a ventilated and cool place, and open the vent cover on the battery.
2. Use the red pliers of the charger to clamp the positive pole of the battery marked with a plus sign, and use the black pliers to clamp the negative pole of the battery marked with a minus sign.
3. Since it is a used battery, it should be charged slowly when charging, and the gear should be adjusted to 2, and the 12-volt power supply should be selected. The current size can be seen from the meter.
4. Plug in the charger and turn on the switch to charge the battery. Most charging times should not exceed 12 hours.