Hand holding Mercedes-Benz Smart Key Fob

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

Are you having trouble starting your car or locking and unlocking the doors with your Mercedes-Benz key fob? There’s a good chance the battery is on its last leg and needs to be replaced. Fortunately, it’s easy to replace a Mercedes-Benz key fob battery, and you can do so in just a few steps. Need to know how to change the battery in a Mercedes-Benz key? Whether you have a new or used vehicle, simply follow the steps below, and your key fob should work like new again.

How to Tell if a Mercedes-Benz Key Fob Battery Needs Replacing

If your key fob’s battery needs to be replaced, you’ll notice the following warning signs:

  • Starting your car will become a chore. If you have to press the button several times, the battery is probably failing.
  • You’ll have trouble using your key fob to lock and unlock your doors, or you may set off the panic alarm.
  • You may notice a warning sign on your dash indicating a problem with the charging system. This can mean the battery inside your key fob is losing power.

If you notice any of these warning signs, change the battery in your Mercedes-Benz key fob, so you can cruise confidently through San Francisco.

How to Replace a Mercedes-Benz Key Fob Battery

Ready to change the battery in your Mercedes-Benz key fob? Follow these simple steps:

  • Figure Out Which Key You Have: Do you have newer Chrome SmartKey® or an older SmartKey®?
  • Purchase a Replacement Battery: An older SmartKey® requires two CR 2025 batteries while the newer Chrome SmartKey® needs just one.
  • SmartKey® for Older Models: If you have an older SmartKey®, pull the latch at the end of the key holder. Then, stick the key horizontally into the open slot. Lift the battery compartment out to replace the batteries.
  • Chrome SmartKey® for Newer Models: If you need to replace a Chrome SmartKey® battery, pull on the tab at the bottom and push the key into the narrow end of the slot. This will remove the cover, allowing you to replace the battery.
Inside of Mercedes-Benz Smart Key with battery exposed

Learn More About Easy Ways to Care for Your Mercedes-Benz

Is the battery in your key fob being stubborn? If so, you can schedule a service appointment at Mercedes-Benz of Marin, and our certified technicians will take care of it. If you have questions about Mercedes-Benz service costs or have another service issue you’d like to resolve, contact us or visit us near Novato and Oakland. While you’re here, don’t forget to ask about our service specials!

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Mercedes-Benz of Marin

540 Francisco Blvd. W, San Rafael, CA

Phone: (415) 233-6509



Phone: (415) 454-0811

540 Francisco Blvd. W, San Rafael, CA


Phone: (415) 455-5508

540 Francisco Blvd. W, San Rafael, CA


Phone: (415) 455-5566

540 Francisco Blvd. W, San Rafael, CA
37.9649957 -122.5158295
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Mercedes-Benz of Marin
Mercedes-Benz of Marin
540 Francisco Blvd. W,
San Rafael, CA, 94901 United States
(415) 233-6509
Mercedes-Benz of Marin 37.9649957, -122.5158295.