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

Model: Mercedes Classe A W169 - Years: 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
Part: Key

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Video tutorial

This tutorial is valid for replacing the key battery for the Mercedes A-Class, B-Class, C-Class, and E-Class. The first step is to remove the metal key from the shell; to do this, pull the small lever located nearby.

The second step is to insert the metal key into the opening of the shell to open the cover where the battery is located. Now, remove the worn battery and replace it with a CR2025 battery, which can also be purchased online.

Once the new battery is inserted, reassemble the shell and then the metal key.


Updated on 30 August 2026 by ScegliAuto


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    Frequently Asked Questions

    • Classe A 2012-2018 - Why is my Mercedes A-Class W176 key not recognized? Read answer

Where are the fuses located on the Renault Laguna?

On the Renault Laguna, the fuses are located inside the fuse boxes installed in the vehicle: in this car model, you will find two boxes for containing the fuses. The first is in the fuse box on the left side of the dashboard, accessible by opening the driver's door: here you will find the fuses for the windscreen wipers, fog lights, horn, etc. The second box is located on the right side of the engine compartment: here you will find the fuses for the dipped headlights, radiator fan, alternator, etc.

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