How to Replace the Battery in an Older Mercedes-Benz E400-COUPE Key?

[DianaRose]

To replace the battery in an older Mercedes-Benz E400-COUPE key, follow these steps: 1. On the back of the key, there is a button. Press and hold this button while sliding the key's back cover forward to open it. The battery is located in a slot nearby. 2. During the replacement process, pay close attention to the battery model. Most Mercedes-Benz keys use a 3V CR2025 battery. Remove the old battery from the slot and replace it with a new one. 3. Reattach the key's back cover securely after replacing the battery. Additional tips: 1. When using the key, avoid placing it near high-power appliances such as TVs, microwashes, washing machines, or computers, as these can reduce the battery's lifespan. 2. Do not expose the key to extremely cold environments below 0°C or hot environments above 50°C, as this will significantly shorten the battery's life.