How often should the battery of a Volkswagen Jetta be replaced?

[StAyla]

The battery of a Volkswagen Jetta should be replaced every four years. Replacement is necessary when the battery's internal resistance and voltage fail to meet the specified values. When the engine is not running, the battery supplies power to all electrical devices in the car and is responsible for starting the engine. After the engine starts, it powers all electrical devices in the car and also charges the battery. As the number of charge and discharge cycles increases, the battery's storage capacity decreases, hence the need for regular replacement. The Volkswagen Jetta is an automobile brand under FAW-Volkswagen Automotive Co., Ltd., equipped with two engines: a 1.4-liter naturally aspirated engine and a 1.5-liter naturally aspirated engine. The 1.4-liter naturally aspirated engine has a maximum power of 90 horsepower and a maximum torque of 132 Nm, with the maximum power achieved at 5,500 rpm and the maximum torque at 3,800 rpm. The 1.5-liter naturally aspirated engine has a maximum power of 110 horsepower and a maximum torque of 150 Nm, with the maximum power achieved at 6,000 rpm and the maximum torque at 3,800 rpm.