How to Check Car Battery Voltage?

[August]

There are several methods to check car battery voltage: 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 the battery is nearly dead and needs replacement. Depending on the design of the battery manufacturer, there may be other forms of charge observation. Refer to the label on the battery for specific instructions. 2. Measure the voltage. Use a battery tester or multimeter to measure the battery voltage. Under normal circumstances, the no-load voltage of the battery is around 13 volts, and the full-load voltage generally does not drop below 12 volts. If the battery voltage is low, it may cause difficulty or failure in starting the vehicle. If the battery remains in a low-voltage state for a long time, it will prematurely fail. 3. Inspect the appearance. Check if there is obvious swelling, deformation, or bulging on both sides of the battery. Once this occurs, it indicates that the battery's lifespan is more than halfway over. 4. Examine the terminals. Look for any white or green powdery substances around the battery terminals. These are battery oxides. High-quality or new batteries will not easily develop these oxides. Once they appear, it means the battery's performance is starting to decline. If these oxides are not removed in time, they can cause insufficient generator output, leading to a discharged state of the battery. In severe cases, this can result in early battery failure or failure to start the car.