How to Charge a Car Battery When It's Dead?

[McVera]

Methods for charging a dead car battery are as follows: 1. Self-recovery of power. When the engine is running, the alternator not only supplies power to the entire vehicle but also charges the battery. However, due to power limitations, during long-distance night driving, the alternator's output is usually only sufficient for lighting needs. Therefore, try to avoid using electrical appliances other than lights during night driving. 2. Use a portable charger to charge the battery. Charging a car starter battery typically requires 20 hours. After charging, perform a battery test to check if it has accepted the charge. A fully charged 12V battery should have an open-circuit voltage of around 13.0V. If the voltage meets this standard, proceed to test the capacity or attempt to start the engine. If successful, the battery is functioning normally; if not, the battery may need replacement.