It's common for batteries to suffer from sulfation and discharge issues due to prolonged inactivity. To address these problems, you can try the shallow cycle high-current charging method for repair. Specifically, first charge the battery with a current less than 5A until it's full. Then discharge it by 30% at an appropriate liquid temperature to clean the sulfate crystals on the surface of the plates and convert them back into active material. Repeating this process several times can eliminate the battery's sulfation.
Additionally, sulfation can cause the battery voltage to drop. If it falls below 10V, the battery cannot store power or charge properly. In this case, a repair device can be used to raise the voltage above 10V to ensure the battery works normally. The repair cost is usually quite affordable, typically just a few dozen yuan, but the exact cost depends on the cause of the fault.
In summary, car starter batteries can be repaired when issues arise, but it's essential to diagnose the problem and choose the appropriate repair method for the best results. If the battery is severely damaged or cannot be repaired, it is advisable to replace it with a new one to ensure the normal operation of the car.
