How to Replace the Battery in an Older Mercedes-Benz C200 Station Wagon Key?

[Martin]

Method for replacing the battery in an older Mercedes-Benz C200 Station Wagon key: First, slide open the tab at the back of the key to remove the mechanical key; Press the internal gray button while using your other hand to push the back end of the key upward. When a gap appears, you can then remove the mechanical key; Use your hand to take out the battery from the back end, and you can then replace the battery; After installing the new battery, reinsert the key holder, and the key battery replacement is complete. The lifespan of a Mercedes key battery is typically two years, while an original factory battery can last up to six years. When the key battery is running low, the Mercedes-Benz vehicle will alert the owner in two ways: Pressing the ignition switch will prompt the dashboard to display a message to replace the key battery; If the indicator light on the key dims or fails to illuminate when pressing the lock or unlock button, it's time to replace the key battery.