How to Fix a Battery That Won't Charge?

[Rodrigues]

The methods to repair a battery that won't charge are: 1. Check if the charging circuit connection is secure, inspect whether the wiring and plug contacts are intact, examine if there are any signs of arcing or burning in the sockets and plugs, and check for any damaged or broken wires; 2. Inspect the charger for any damage and verify if the charging parameters meet the requirements, i.e., the initial charging current should reach 1.6A to 2.5A per cell; 3. Check if the battery is dry internally, meaning if there is severe electrolyte depletion, and also inspect for irreversible sulfation on the plates; 4. Secure the charging circuit connections firmly and replace any malfunctioning charger; 5. For dry batteries, add pure water or sulfuric acid, perform maintenance charging and discharging to restore battery capacity. If irreversible sulfation is detected, perform equalization charging to recover capacity; 6. For dry batteries after adding electrolyte, the maintenance charging should control the maximum current at 1.8A, charging for 10 to 15 hours, with the voltage of all three batteries ideally above 13.4V. If the voltage difference between batteries exceeds 0.3V, it indicates asynchronous irreversible sulfation, and such batteries require replacement of the entire set or activation.