When it comes to the question of how often to replace the car battery in a Passat, the answer is typically every 3 to 4 years.

The life span of a car battery depends entirely on its usage. The battery's durability is closely related to the vehicle condition, vehicle configuration, and driving habits. For example, the more electronic components a car has, the greater the workload and damage to the battery, and the shorter its life span. If you feel that the battery cannot be charged or the engine starts weakly, and the lights become明显 dimmer, you should remove the battery and use a charger for 12-24 hours. If the mileage is over 50,000 kilometers and the generator has no故障, it is time to consider replacing the battery.

To maintain the battery, you should:

• Avoid leaving the car in a露天 parking lot for long periods to avoid being exposed to the sun.
• 避免频繁启动车辆；
• Regularly check the battery's accessories and connection lines.
• Do not use any electrical devices in the car after turning off the engine.

In summary, the life of a car battery is determined by various factors, and it is essential to take care of it to ensure its optimal performance. By following these simple maintenance tips, you can extend the battery's life and avoid unexpected breakdowns.