How often should a family car battery be replaced?

[MacPaul]

Generally, a family car battery should be replaced every 2-3 years. Here is some relevant information about car batteries: Working principle: During charging, electrical energy is converted into chemical energy, and during discharging, chemical energy is converted back into electrical energy. When the battery discharges, lead metal acts as the negative electrode, undergoing oxidation to become lead sulfate; lead dioxide serves as the positive electrode, undergoing reduction to also become lead sulfate. Battery maintenance: Avoid parking the car in open parking lots for extended periods. If long-term parking is necessary, remove and take the battery with you to prevent freezing damage. Car batteries should be charged regularly. If left unused for long periods, they will gradually self-discharge until they become unusable. Therefore, start the car periodically to charge the battery.