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How to Replace the Key Battery of the Mercedes-Benz B-Class W246

Model: Mercedes Classe B MK 2, W246 - Years: 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019
Part: Key

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Video tutorial

If the battery inside your Mercedes-Benz B-Class W246 (2011-2019) smart key is completely flat and you want to know how to replace it, simply read the following instructions carefully and put them into practice. First, fully remove the physical emergency key. Then, use a small flat screwdriver to open the cover and extract the battery holder.

Finally, remove the old flat battery and replace it with the new one, ensuring full compatibility. Reassemble everything and you are done.


Updated on 13 June 2026 by ScegliAuto


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