How to Replace the Battery in a Mercedes-Benz SL-Class Key?

[LeLogan]

Here are the steps to replace the battery in a Mercedes-Benz SL-Class key: 1. Remove the emergency key unit. 2. Insert the emergency key unit into the opening in the key. 3. Use the emergency key unit to press the gray release button inside the opening in the direction of the arrow. 4. The battery tray will unlock; pull the battery tray out of the key. Use the emergency key unit to slide the old battery out of the battery tray. 5. Insert the new battery with the positive symbol facing up under the contact spring. Notes: Use a lint-free cloth during the operation. Push the battery tray back into the key housing until it clicks into place. Check the functionality of all buttons on the vehicle key.