How to Fix a Dead Car Battery?

[VonMaddox]

If the battery is not holding charge, it may be due to insufficient battery electrolyte, which can be fixed by adding more electrolyte. Another possible reason for the battery not holding charge is sulfation. In this case, a desulfation charge using positive and negative pulses can be applied to repair the battery. If the battery has internal broken plates, manual disassembly and replacement of the plates can be performed for repair.

[Pedro]

I frequently deal with car battery issues. When the battery is dead, first check if it's just discharged or completely dead. If it can still be revived, use a charger to slowly recharge it. Connect the red clamp of the charger to the positive terminal and the black clamp to the negative terminal or engine ground. Set the slow charging current between 2 to 5 amps. Charge in a well-ventilated area to prevent overheating. For lead-acid batteries, also check the electrolyte level and top up with distilled water to the maximum line if low. Charge for 8 to 12 hours until the voltage reaches 12.6 volts. After charging, start the engine - if it cranks, drive a few kilometers to let the alternator recharge it. Keep a charger in your garage for emergencies. When replacing the battery, choose a reputable brand to avoid frequent issues.