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How to Replace the Battery of a Mercedes Class B Key Fob

Model: Mercedes Classe B W245, MK 1 - Years 2005-2011
Part: Key

How do you replace the worn battery of a Mercedes Class B key fob? Follow this detailed video: take your key fob and slide the button to release the metal key. Once extracted, use it to pry open the key cover; lever it until the two pieces separate. Remove the exhausted battery with a screwdriver; take a new one of the same size and voltage. Reassemble the cover with the buttons by pressing on the key fob until you hear the locking click. Insert the metal key back into the key fob. Check the proper functioning of the key fob.

Updated on 3 March 2026 by ScegliAuto

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