Can a Car Battery Be Charged at Idle Speed When It's Dead?

[VanHarper]

When a car battery is dead, it can be charged at idle speed. The functions of a car battery include: 1. Providing power to the starting system, ignition system, and electronic fuel injection system when starting the engine; 2. Supplying power to the car's electrical equipment when the engine is stopped or at low idle speed; 3. Assisting in powering electrical equipment when the generator's output is insufficient; 4. Mitigating voltage surges in the electrical system to protect the car's electronic devices; 5. Storing excess electricity generated by the alternator. The maintenance methods for a car battery are: 1. Clean the exterior of the battery with a damp cloth; 2. Wipe off any dirt on the terminals and posts that could cause leakage; 3. Open the battery water cap and check if the water level is at the normal position; 4. Verify whether the battery is charging properly.