How Long Can a Car Battery Last Without Driving?

[StellaLynn]

A car battery can last for about 15 days without driving. Here are the related details: 1. The functions of a car battery are: (1) When starting the engine, the battery supplies power to the starting system, ignition system, and electronic fuel injection system. (2) When the engine is off or idling at low speed, it provides power to the car's electrical equipment. (3) When the alternator's output is insufficient, it can assist in supplying power to the electrical equipment. (4) It mitigates voltage surges in the electrical system, protecting the car's electronic devices. (5) It stores excess electricity generated by the alternator. 2. Battery maintenance methods include: (1) Starting the car periodically to recharge the battery. (2) Adding distilled water or a special replenishing fluid when the electrolyte level is low. (3) Regularly checking the ventilation holes on the battery cover and inspecting the positive and negative terminals for signs of oxidation during daily driving.