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How to Replace the Key Fob Battery for the Mercedes A-Class

Model: Mercedes Classe A W177 - Years: 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026
Part: Key

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Video tutorial

In this video tutorial, you can see how to replace the battery in the key fob for the Mercedes A-Class. The same procedure applies to other models like the B-Class and other relatively recent versions.

First, take the key in one hand and remove the manual key. To do this, press the release button and pull out the manual key. Now, take a flathead screwdriver and insert the tip into the slot where you removed the manual key. Press on the clip, and the cover can be lifted.

Next, simply flip the key fob over to remove the battery.

Replace the battery with a new working model: CR2025. Finally, reassemble the key fob in reverse order.


Updated on 20 June 2026 by ScegliAuto


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by ScegliAuto

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