How to Replace the Battery in a Mercedes-Benz E350-4MATIC Key?
2 Answers
Here are the steps to replace the battery in a Mercedes-Benz E350-4MATIC key: 1. There is a button on the back of the key. Press this button and push the back cover forward to open the key. 2. The battery is located in the slot nearby. During the replacement process, be sure to note the battery model for the Mercedes-Benz E350-4MATIC key, which is 3V-CR2025. 3. After prying open the slot, remove the old battery and replace it with a new one. 4. Next, reattach the back cover of the key, and the installation is complete. Additional Information: The lifespan of a Mercedes-Benz key battery is typically two years, while the original factory battery can last up to six years. When the key battery is low, the Mercedes-Benz vehicle will provide two types of alerts: one is pressing the ignition switch, which will display a message on the dashboard to replace the key battery. The second is pressing the lock or unlock button on the key, where the indicator light on the key will dim or fail to illuminate.
I enjoy fixing things myself, and changing the battery for my Mercedes-Benz E350 key is quite convenient for me. There's a small switch or sliding groove on the back of the key. Gently push it open with your finger to reveal the cover, inside which is a round coin battery, typically a CR2025. Remember not to use metal tools to pry out the old battery to avoid scratching the contacts. When inserting the new battery, make sure the positive side faces up, then close the cover and press it firmly. After that, press the unlock button on the key to test it—if the light turns on, it means it's successful. It's recommended to check the battery life every 1-2 years and keep a spare CR2025 in the car to avoid being caught off guard in emergencies. The whole process takes just 5 minutes, doesn’t damage the key, and saves a bit of money.
