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How to Replace the Key Fob Battery of a Mercedes S-Class

Model: Mercedes Classe S W221, MK 5 - Years 2005-2013
Part: Key

How do you replace the battery in the key fob of a Mercedes S-Class? Let's see how to do it in this video. Take your key fob and use a screwdriver to pry between the key cover and the plastic cap on top of the cover (where the battery holder is located). Pry until the cap separates from the cover, then extract the worn battery with a screwdriver, take a new one of the same size and voltage. Reassemble the battery holder in the key fob cover until you hear it click into place. Check the proper functioning of the key fob by testing the door lock and unlock buttons.

Updated on 12 March 2026 by ScegliAuto

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