How to Replace Batteries in a Mercedes Key Fob

Written by matthias will
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How to Replace Batteries in a Mercedes Key Fob
You can replace the battery in your Mercedes key fob by yourself. (suv mercedes ml image by alma_sacra from

A key fob battery almost never outlasts the life of the vehicle, and will require replacement at some point. Replacing the battery in most fobs takes only a few minutes and requires no training. Mercedes key fobs can be very expensive to replace, so it is usually better to install a new battery rather than get a new fob.

Skill level:

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Things you need

  • Standard screwdriver
  • Coin

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  1. 1

    Open the battery compartment on the fob. Many key fobs for Mercedes have a battery compartment on the end. Push it off to open. Some fobs have the compartment on the back. Open this kind with a standard screwdriver or a coin. Insert the edge into the slot and turn counter-clockwise. Some newer Mercedes key fobs require you to release the key from the fob, then pop open the battery compartment inside the keyhole.

  2. 2

    Identify which battery you need. The identification number should be on the surface of the battery, such as CR2025. Purchase an identical battery.

  3. 3

    Insert the new battery, ensuring you have it facing the right way. The batteries are clearly marked with a "+" on one side and a "-" on the other. Installing it the wrong way will prevent the fob from working.

  4. 4

    Test the new battery by trying to unlock your car via the key fob.

Tips and warnings

  • If you are having trouble finding the battery, take the fob to a dealer. They will open it for you, usually without charge.
  • Refer to your owner's manual for specific information regarding your key fob.

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