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Replacing the Key Battery in a Mercedes B-Class

Model: Mercedes Classe B MK 3, W247 - Years: 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026
Part: Key

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Video tutorial

Today, you will see how to replace the battery in a Mercedes B-Class key. The first step is to pull out the metal key, then with a little pressure on the rear cover, push it outward to remove it. You will notice a small drawer that, with the help of the metal key, you will open to remove the flat battery and replace it with a new one of the same size and voltage.

After replacing the battery, close the cover and put the key back in its housing.

You are ready to test the key's proper functioning; your work ends here.


Updated on 8 June 2026 by ScegliAuto


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Watch the video!


by ScegliAuto

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