How to Repair a Car Battery?
2 Answers
Use a charging voltage higher than the standard battery voltage, approximately 1.3-1.5 times the standard voltage, such as using a 48V charger for a 36V battery. Use a charging voltage higher than the standard battery voltage, approximately 1.5-2.0 times the standard voltage, such as using a 3-4A voltage to charge a 20AH battery. Fully charge the battery and then completely discharge it. Performing 1-2 full charge-discharge cycles can improve the battery's capacity. The battery may be irreparable due to prolonged use or improper handling, requiring replacement with a new one.
This is a common issue we encounter in our repair shop. Don't rush to throw away a failing battery! First, check the battery terminals for white crystalline deposits, which indicate oxidation. Pouring boiling water over them can wash it away, then sand the contact surfaces of the terminals and clamps. If it's a refillable battery, check if the electrolyte level is low and top it up with distilled water to the marked line. If the battery won't hold a charge, try using a pulse desulfator, which works particularly well for sulfated plates. However, if the battery is bulging, leaking, or has been in use for five to six years, it's better to replace it for peace of mind. Always remember to turn off lights when parked to avoid draining the battery—that's the golden rule.
