How to Replace the Battery in an Older Mercedes-Benz E550 4MATIC Key?

[LaDamian]

The method to replace the battery in an older Mercedes-Benz E550 4MATIC key mainly involves the following steps: 1. Flip open the tab at the rear end of the key to remove the mechanical key. 2. Insert the mechanical key into the side slot of the key and press the internal gray button. 3. With the other hand, push the rear end of the key upward until a gap appears, then remove the mechanical key. 4. Finally, pull out the rear end by hand to replace the battery. Additional information: The Mercedes-Benz key design is not related to the model or series. This means that during the same era, whether it's a C-Class, E-Class, or S-Class, their keys are basically the same, and the method for replacing the battery is roughly identical.