When charging a battery, should the positive or negative terminal be connected first?

[SarahRose]

The positive terminal should be connected first when charging a battery, and the negative terminal should be disconnected first after charging is complete. The functions of a car battery are: 1. To supply power to the starting system, ignition system, and electronic fuel injection system when starting the engine; 2. To provide power to the car's electrical equipment when the engine is off or idling at low speed; 3. To participate in power supply when the electrical demand exceeds the generator's capacity; 4. To stabilize voltage and protect the car's electronic equipment. Maintenance methods for car batteries include: 1. Regularly clean the battery; 2. Reduce the use of electrical equipment when the engine is off; 3. Replace the battery periodically; 4. Start the car regularly.