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Replacing the Remote Key Battery on the Mercedes A - B - C Class

Model: Mercedes Classe B W245, MK 1 - Years 2005-2011
Part: Key

In today's tutorial, you will learn how to disassemble and replace the battery in the remote key for the Mercedes A Class W169, as well as the B Class W245 and C Class W204. First, take your remote and remove the key from inside by sliding the button; then, lever off the sides of the rear cover to remove it, as shown in the video. This will give you access to the battery; remove it from its compartment and replace it with a new one of the correct type (in this case, a CR 2025 3V). Follow the video to the end for reassembly!

Updated on 23 April 2026 by ScegliAuto

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