How Often Should Car Batteries Be Replaced?

[Rick]

Car batteries are generally replaced every 3 years. The maintenance methods for batteries include: 1. Turn off the lights, audio system, and air conditioning before shutting down the engine; 2. Ensure the vehicle is driven regularly and not left unused for extended periods; 3. Clean the exterior of the battery periodically; 4. Regularly check the battery's charge retention capacity. The functions of a car battery are: 1. Providing power to the starting system, ignition system, electronic fuel injection system, and other electrical equipment during engine startup; 2. Supplying power to the vehicle's electrical equipment when the engine is off or idling at low speed; 3. Assisting in power supply when the electrical demand exceeds the generator's capacity; 4. Mitigating voltage spikes in the electrical system to protect the vehicle's electronic devices; 5. Storing excess electricity generated by the alternator.