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

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

This short video demonstrates how to replace the battery in the key for the Mercedes-Benz B-Class. The procedure is very simple and takes little time to complete.

To replace the key battery, first extract the emergency key; once extracted, use it to remove the lower part of the key where the batteries are located. After removing the old batteries, insert the new ones, then reattach the part of the key with the batteries into its housing and reinsert the emergency key. At this point, the procedure is complete, and the batteries have been replaced correctly.


Updated on 4 October 2026 by ScegliAuto


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by ScegliAuto

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