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How to Replace the Key Battery on a Mercedes B200

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

If you own a Mercedes B200 and want to know how to correctly replace the battery inside the key, follow the instructions in this guide. First, locate the small button on the back of the cover and press it to remove the cover. Once removed, use a small flat screwdriver to take out the battery holder and proceed to replace the old exhausted battery with a new one.

Updated on 30 August 2026 by ScegliAuto

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