The power status of the battery is tested. The test results are divided into four types (fully charged, normal, recharged, and completely discharged), suitable for batteries ranging from 10AH to 200AH. The circuit of the tester does not need to be divided into positive and negative polarities. The battery tester clearly shows the open-circuit voltage indication value of the battery under test on its surface, along with the detection switch used during the test. It is convenient to operate. The tester is connected to the battery under test. The voltmeter shows the voltage value of the battery. The nominal normal voltage of the battery is between 12.5v and 13v. Pull the test switch, and the pointer will drop. The indicated value represents the status of the battery under test with the corresponding capacity: normal, recharged, or fully discharged. The power generation capacity of a 12v generator can be directly tested.

Usage method 
1. Clamp the two clips of the tester onto the positive and negative terminals of the battery. At this point, the indicator light will be on (the end of the clip on the illuminated side is the positive terminal of the battery), and the voltmeter will indicate the battery voltage, which is the virtual voltage (no-load voltage) at this time.
2 If the light does not come on or the pointer of the voltmeter does not move, check whether the clamp of the tester is in good contact with the battery terminal.
3 Twist the toggle switch for no more than 5 seconds (at this time, the tester discharges the battery at 100A). The pointer of the voltmeter will shift to the left. Determine the battery's power status based on the shift position. The test results can roughly be divided into the following five situations:
A pointer in the green zone indicates that the battery is fully charged.
2. If the pointer is in the yellow zone and stable, it indicates that the battery is low and needs to be charged.
3. If the pointer falls back to the left quickly, it indicates that the battery has run out of power.
4. If the pointer returns to zero, it indicates that the battery may be disconnected.
5. If the pointer is in the red area, it indicates that the battery power is very low and there may be a defect in the battery.