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

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

If the doors do not unlock using the remote control of the Mercedes B-Class, it may be due to a flat battery. To replace it, you will need to purchase a new CR2025 battery. To perform the operation, first extract the mechanical key and use it to lever from the opposite side of the slot to remove the black cover. Once the cover is removed, simply take out the battery and replace it, ensuring it does not fall. After that, you can reposition the cover by inserting it first from the side with the teeth and reinserting the metal key into its housing.

Updated on 23 June 2026 by ScegliAuto

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