Can a Bad Car Battery Be Repaired?
2 Answers
Car batteries can be repaired when they fail. The repair methods and conclusions are as follows: Methods: Use positive and negative pulse charging to depolarize the battery, then fully discharge it, followed by water replenishment. The water added must be deionized or purified water. Conclusions: During the discharge process, the electrons of the Pb4+ ions on the positive plate become Pb2+ ions, which combine with sulfate ions to form lead sulfate deposited on the positive plate. The Pb4+ ions on the positive plate gradually convert to Pb2+ ions, causing the potential to decrease steadily. Meanwhile, electrons continuously flow out from the negative plate. During charging, the positive terminal of an external DC power source connects to the positive plate of the battery, and the negative terminal connects to the negative plate.
I've also experienced a dead car battery before. Whether a battery can be repaired depends on the specific situation. If the battery casing is cracked or it's been used for four or five years, then it's basically hopeless and you should just replace it. But if it's just drained from the car sitting too long, charging it overnight with a charger can usually revive it. My friend once tried replenishing the electrolyte with distilled water - that only works with the type of battery that has removable caps on top, and it requires a special charger. To be honest, these operations require some experience, so beginners shouldn't mess with them. If you've tried everything and still have trouble starting the car, chances are the battery is completely dead. Nowadays, replacing a new battery only costs a few hundred yuan, which is both worry-free and safe.
