Should the Positive or Negative Terminal of a Car Battery Be Disconnected First?

[SanDonovan]

When disconnecting a car battery, the negative terminal should be removed first. The negative terminal of the car battery is connected to the vehicle's body, and since the body is made of metal, the entire vehicle is effectively connected to the negative terminal. Therefore, when the negative terminal is disconnected, the car's electrical circuit is immediately broken (the battery can no longer supply power). The primary functions of a car battery are to store and supply electrical energy, and they can be categorized into lead-acid batteries and maintenance-free batteries. To maintain a car battery, follow these methods: 1. Avoid multiple consecutive starts; 2. Regularly inspect components and wiring connections; 3. Avoid using electrical devices after turning off the engine.