How to Change the Battery in Your Mercedes-Benz Key Fob

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Is the battery in your new Mercedes-Benz key fob coming to the end of its life? Find out the warning signs that your key fob may need a new battery, and how to replace it, below!

When a Mercedes-Benz Key Fob Battery Needs Replacement

There are several warning signs to take note of that can indicate your Mercedes-Benz key fob battery is losing power. Initial warnings can include:

  • You may have a harder time starting your vehicle. If it takes multiple attempts or a few minutes, you could be due for a new battery.
  • If you’re no longer able to lock and unlock your doors or set off your panic alarm.
  • If you notice a warning sign on your dashboard that indicates an issue with the charging system, that can mean you are losing battery power in your key fob.

If you’re experiencing any of these issues, you’ll want to take the proactive step to replace the battery in your Mercedes-Benz key before it dies completely.

Replace Your Mercedes-Benz Key Fob Battery

When you need to change the battery in your Mercedes-Benz key fob, there are only a few steps that you need to follow:

  • Determine Your Key Type: You could either have a Chrome Key or a Smart Key, and your key type impacts how you change the battery.
  • Get the Right Batteries: The newer Chrome Key only needs one CR 2025 battery, and the older Smart Key needs two.
  • Smart Key: For the Smart Key pull the latch at the end of the key holder, stick your key horizontally into the open slot, and lift the battery compartment out to replace the batteries.
  • Chrome Key: When changing a Chrome Key battery, pull on the tab at the bottom, push the key into the narrow end of the slot to remove the cover, and replace the battery.

If you’re having any issues, feel free to schedule an appointment at our Mercedes-Benz of St. Louis service center and one of our technicians can replace it in a flash.

Explore Mercedes-Benz Service Costs at Mercedes-Benz of St. Louis

Have additional questions about replacing your battery, or have you replaced your battery and are still having issues? The specialized team at the Mercedes-Benz of St. Louis service center can help you with your Mercedes-Benz service needs at a reasonable price. Contact us with any questions and make sure you check out our service specials before booking your appointment.

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Mercedes-Benz of St. Louis

1048 Hampton Ave. St. Louis, MO

Phone: (314) 647-2400


Phone: (314) 647-2400

1048 Hampton Ave. St. Louis, MO


Phone: (314) 647-2400

1048 Hampton Ave. St. Louis, MO


Phone: (314) 647-2400

1048 Hampton Ave. St. Louis, MO
38.6300409 -90.2865099
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Mercedes-Benz of St. Louis
Mercedes-Benz of St. Louis
1048 Hampton Ave.
St. Louis, MO, 63139 US
(314) 647-2400
Mercedes-Benz of St. Louis 38.6300409, -90.2865099.