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How Long Can a Car Battery Sit Before It Won't Start?

1 Answers

Ronan

07/30/25 7:08am

If a car is parked for about half a year, the battery will likely be too weak to start the engine. If the car is equipped with an anti-theft device, the battery may drain in approximately four months. Therefore, if the car won't be used for an extended period, it's best to start it once a month and let it run for half an hour each time to recharge the battery. More relevant information is as follows: 1. Battery Depletion: The so-called complete battery depletion doesn't mean the voltage drops to 0V, but rather to 10.5V. Currently, the nominal voltage of car batteries is 12V, and under no-load conditions, the measured voltage should typically be between 12.5~12.8V. The so-called rated capacity of a battery refers to the capacity output by a fully charged new battery when continuously discharged at a 20-hour rate under an average temperature of 30°C until the voltage drops to 10.5V. 2. Battery Charging: To prevent the battery of a long-term parked car from discharging, the best practice is to start the car regularly, allowing the car's built-in alternator to recharge the battery. If the battery is in good condition, starting it every two weeks and running it at around 2,000 RPM for about half an hour can usually replenish the self-discharge. If the battery's technical condition is poor, it's advisable to start the car once a week.

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