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

how to change the battery in your mercedes-benz key fob

When you push the button on your Mercedes-Benz key fob, your Mercedes-Benz vehicle should respond immediately. So, if the battery in your Mercedes-Benz key fob isn’t working consistently, it may be time to replace it. Learn about the warning signs of a dying battery and how to replace the battery in your Mercedes-Benz key fob if needed. We’ll even help you determine which battery to use for your Mercedes-Benz key fob.

When a Mercedes-Benz Key Fob Battery Needs Replacement

If you think your Mercedes-Benz key fob battery is dying, check to see if you’re experiencing any of the warning signs below:

  • Your vehicle is becoming difficult to start, either taking several minutes or numerous attempts.
  • You cannot lock/unlock your doors or you’re having trouble setting off the panic alarm with your key.
  • There’s a warning sign on your dashboard that notes an issue with the charging system.

If you’ve experienced any of the warning signs mentioned above, there’s a good chance your Mercedes-Benz key fob battery needs to be changed.

How to Replace Your Mercedes-Benz Key Fob Battery

If you determined that your Mercedes-Benz key fob needs a new battery, don’t worry — doing so is easy and only takes a few minutes to do on your own! To change your key fob battery, follow the steps below:


  • First, identify what type of key you have. You’ll either have a Chrome Key or a Smart Key. The type of key you have affects how you’ll change your batteries.
  • Then, after determining what type of key you have, it’s time to determine which battery to choose for your Mercedes-Benz key fob. A Smart Key will need two CR 2025 batteries; newer Chrome Keys only need one battery.
  • If you’re changing the batteries in a Smart Key, pull on the tab located at the end of your keyholder. Then, press your key horizontally into the opening and raise the battery compartment. Once the battery compartment is opened, replace the batteries.
  • If you have a Chrome Key, pull the latch at the bottom and push the key into the thinner end of the slot. Then, remove the cover and replace the old battery with the new one.
  • For either key, make sure that the new battery is facing in the right direction.

Why Choose OEM Mercedes-Benz Parts?

If you find you need a new key fob, make sure you purchase one of the genuine OEM Mercedes-Benz key fobs at our parts department in Burlington. That’s because there’s no guarantee that you’ll be able to sync up an aftermarket key fob with your Mercedes-Benz model. Furthermore, your Mercedes-Benz key fob is highly durable and designed to last for years to come, unlike the cheaply made, one-size-fits-all options at your corner auto shop.

Explore Mercedes-Benz Service Costs at Mercedes-Benz Burlington

If you need help replacing your Mercedes-Benz key battery, or determining which battery to use for your Mercedes-Benz key fob, visit us at Mercedes-Benz Burlington. Our service center near Milton and Mississauga can help. Contact us with questions about our Mercedes-Benz service, costs, and more, before scheduling an appointment online today.

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