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How to Replace the Key Battery in a Mercedes-Benz A-Class W177

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

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Video tutorial

If the key for your new Mercedes-Benz A-Class W177 has suddenly stopped working, you need to replace the button cell battery inside. This is a simple task that anyone can do independently.

First, press the small button located at the bottom of the rear cover and remove it. Next, slide out the battery holder from the side and remove the old battery. Replace it with a new, compatible model and properly reattach the rear cover.

The replacement is complete.


Updated on 13 May 2026 by ScegliAuto


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by ScegliAuto

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