How to Test a Car Battery?

[DelLilliana]

Methods for testing a car battery: 1. Check the observation port. The colors visible in the observation port are generally divided into three types: green, yellow, and black. Green indicates sufficient charge, yellow indicates slight discharge, and black means it is almost dead and needs replacement; 2. Check the voltage. Measure the battery voltage using a battery tester or multimeter. Under normal circumstances, the no-load voltage of the battery is around 13 volts, and the full-load voltage generally does not fall below 12 volts; 3. Check the appearance. Observe whether there is obvious swelling, deformation, or bulging on both sides of the battery; 4. Check the terminals. Observe whether there are white or green powdery substances around the battery terminals.