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

Model: Mercedes Classe B W245, MK 1 - Years 2005-2011
Part: Key

Replacing the remote battery in a Mercedes-Benz B-Class, as shown in this tutorial, is an extremely simple and quick task. You will need a replacement CR2032 battery and a small flathead screwdriver. Start by extracting the emergency metal key by pressing the designated button, then separate the rear cover by prying with the screwdriver in the indicated slot. At this point, you can remove the old battery, insert the replacement while observing the correct polarity, and reassemble everything.

Updated on 31 July 2026 by ScegliAuto

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