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When a car is not used for a long time, should the positive or negative terminal of the battery be disconnected?

1 Answers

DeNaomi

07/30/25 12:49am

When a car is not used for a long time, the negative terminal of the battery should be disconnected. Disconnecting the negative terminal cuts off most of the standby power consumption in the vehicle, allowing the battery to discharge naturally. Removing the negative terminal can help the car stay parked for a longer period and better protect the battery. The reason for disconnecting the negative terminal first is that the negative terminal of the car battery is connected to the car body, which is made of metal, meaning the entire body is connected to the negative terminal. If the positive terminal is disconnected first, it may easily lead to electrical conduction. Generally speaking, disconnecting the negative terminal of the car battery will not cause any problems for one to two months. However, long-term parking can still affect the car battery and other components. For example, prolonged parking can cause tire deformation leading to premature tire failure, oxidation and deterioration of engine oil, and paint peeling.

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