How to Check if the Battery is Good or Bad?

[HaleyRose]

Check if the battery is good or bad by following these methods: 1. Observe the inspection window—green indicates sufficient charge, black means slightly discharged, and white indicates the battery is dead and needs replacement; 2. Use a battery tester or multimeter to measure the battery voltage. Normally, the no-load voltage should be around 13V, the load voltage should not drop below 12V, and the starting voltage should not be lower than 9.5V; 3. Check if there is noticeable swelling, deformation, or bulging on both sides of the battery; 4. Look for any white or green powdery substances around the battery terminals, which are signs of oxidation. High-quality or new batteries usually do not develop these oxides easily. If they appear, it means the battery's performance is starting to deteriorate.