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How Long Can a Car Battery Last After Disconnecting the Negative Terminal?

1 Answers

Peyton

07/30/25 3:30am

Disconnecting the negative terminal of a car battery can allow it to last for one to two months, but it is not advisable to leave the car idle for an extended period. Prolonged inactivity not only affects the car battery but also has certain impacts on other components of the vehicle. For instance, if a car is left unused for too long, the tires may deform or even wear out prematurely, the engine oil may oxidize and deteriorate, and the paint may peel off. Disconnecting the negative terminal of the battery effectively cuts off most of the standby power consumption in the vehicle, allowing the battery to discharge naturally. When the natural discharge rate is very low, the car can remain idle for a relatively longer period with the negative terminal disconnected. Therefore, for some push-to-start models or older vehicles, disconnecting the negative terminal during long-term storage can better protect the battery.

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