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How to Replace the Key Fob Battery in a Mercedes-Benz B-Class?

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

Replacing the battery in the key fob of a Mercedes-Benz B-Class, as shown in this tutorial, is an extremely simple and quick task. For this, you will need a replacement CR2025 battery and, if necessary, a small flathead screwdriver. First, extract the emergency metal key by pressing the relevant button, then insert it or the screwdriver into the indicated slot, pry it open, and unlock the rear cover. At this point, you can remove the old battery, insert the replacement the right way round, and reassemble everything.

Updated on 15 July 2026 by ScegliAuto

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