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Replacing the Battery of a Mercedes C-Class Key Fob

Model: Mercedes Classe C W203 - Years 2000-2007
Part: Key

Are you replacing the battery of a Mercedes C-Class key fob? Here's how to do it: Take your key fob and slide the button to release the metal key. Once the key is out, use a lever to pry the battery holder from the cover (as shown in the video). Remove the battery from the compartment (use a small screwdriver), take a new one of the same size and voltage. Reinstall the plastic battery holder into the key fob cover, and finally insert the metal key back into the cover. Check that the key fob works correctly.

Updated on 9 March 2026 by ScegliAuto

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