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Replace the Key Fob Battery on a Mercedes-Benz B-Class

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

How do you replace the battery in the key fob of a Mercedes-Benz B-Class? This detailed video shows you how. Take your key fob and use a screwdriver to pry between the key cover and the plastic cap on top of the cover. Pry until the battery holder comes out of the cover, then remove the worn battery with a screwdriver. Get a new battery of the same type and voltage. Reattach the cap to the key fob cover until you hear a click. Check that the key fob works correctly by testing the door lock and unlock buttons.

Updated on 28 February 2026 by ScegliAuto

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