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How to Replace the Battery in the Mercedes Key

Model: Mercedes Classe A W177 - Years 2018-2026
Part: Key

Today, we will replace the dead battery in the Mercedes A-Class key. First, remove the metal key from the cover, and using the same key, pry from the inside out on the plastic cap. Once the cap is open, you will immediately see the dead battery that needs to be replaced with a new one of the same size and voltage. So, remove the dead battery and insert the new one, close the cap, and put the metal key back inside. Finally, test the key to ensure it works correctly, and your job is done.

Updated on 8 June 2026 by ScegliAuto

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