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

Model: Mercedes Classe B W246, MK 2 - Years 2011-2019
Part: Key

Start by pressing the button on the top of the electric key of your Mercedes B-Class to release the physical emergency key, then remove it. Next, unclip the rear cover of the electric key to access the flat battery. Proceed to extract the battery from its housing. Once you have completed this step, the disassembly will be finished. To fit the new battery and close the key, simply follow this procedure in reverse, and the replacement will be complete.

Updated on 4 April 2026 by ScegliAuto

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