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How to Replace the Worn Key Battery of a Mercedes

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

Do you want to change the battery of your Mercedes key remote? Follow this guide to proceed. First, move the black lever and remove the metal key from its housing. Insert the key into the slot of the remote and press the internal button to release the battery cover. Once the plastic cover is removed, replace the worn battery with a new one (same size and voltage). Finally, refit the black plastic cover and insert the metal key back into its housing. Test the correct operation of the key remote.

Updated on 25 February 2026 by ScegliAuto

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