What are the methods to distinguish between good and bad batteries?

1 Answers
VonCorbin
07/29/25 9:51am
Methods to distinguish between good and bad batteries are: 1. Inspect the appearance: Check if the battery casing is bulging, leaking, has broken separators, or corroded terminals. If these signs are present, it indicates the battery is dead; 2. Test the voltage: After charging for two hours, measure the voltage of individual battery cells every 20 minutes. If the voltage is below 13, it indicates a problem. During discharge, test every 10 minutes in three intervals. If the discharge time is faster than other batteries and the voltage drops below 10V, the battery is faulty; 3. Check for water loss and blackening: After charging the battery for 36 hours, if the charger's red light remains on, it indicates severe water loss. Open the battery's top cover to reveal six round holes. Check the color of the electrolyte in each hole. If it appears black, it means the lead powder from the plates has fallen off, indicating the battery is dead.
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