How Long Can a Car Battery Sit Without Going Dead?

[MacRylee]

An car battery typically goes dead after sitting for about two months. Methods for charging a dead car battery include: 1. Quick charging: Quick charging only superficially reactivates the battery, without fully charging the internal components; 2. Slow charging: This takes 10 to 15 hours, and deeply discharged batteries must undergo slow charging. Insufficient charging time or charge can directly affect the vehicle's driving performance. The functions of a car battery are: 1. To power the starting system, ignition system, and electronic fuel injection system when starting the engine; 2. To supply power to the car's electrical equipment when the engine is off or at low idle; 3. To assist in power supply when the electrical demand exceeds the generator's capacity; 4. To stabilize voltage and protect the car's electronic devices.