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

October 25th, 2018 by

Is the battery of your Mercedes-Benz key fob on its last legs? In the guide below, we’ll go over the telltale signs of a dying key fob battery, how to open your Chrome Key or Smart Key, and how to replace the battery.

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When To Replace Your Mercedes-Benz Key Fob Battery

There are several warning signs that indicate it’s about time to change the battery in your Mercedes-Benz key fob:

  • You may notice your vehicle is gradually becoming more difficult to start. If it takes several minutes or multiple attempts, it can be an indicator of a weak key fob battery.
  • If you lose the ability to lock and unlock your doors or set off the panic alarm, your battery might be on its way out.
  • If you notice a warning sign on your dashboard that indicates an issue with the charging system, it can mean that you are losing battery power in your key fob.

If you experience any of these warning signs, take the proactive step to change the battery in your Mercedes-Benz key fob to prevent issues when on the road in West Bloomfield.

Which Mercedes-Benz Key Fob Battery Do I Need?

When it comes time to change the battery in your Mercedes-Benz key fob, the first thing you’ll need to do is determine whether you have a Chrome Key or a Smart Key. This will impact how the batteries are changed because a Smart Key needs two CR 2025 batteries, while the newer Chrome Key only needs one.

How to Open Your Mercedes-Benz Car Key Fob to Replace the Battery

You’ll need to follow slightly different steps to open a Chrome Key and a SmartKey—but once you get your key fob open and access the battery, changing it out is simple! Here’s how to open a Mercedes-Benz key fob for the Chrome Key or Smart Key:

To open a Mercedes-Benz Chrome Key and replace the battery:

  • Look for a silver square-shaped tab on the bottom of the key. Pull it until it releases the spare key.
  • You should now see a small gap in the fob casing. Push the spare key into the narrow and flat end of the fob and open the key cover.
  • Remove and replace the old battery, ensuring that it is facing the right way.

To open a Mercedes-Benz Smart Key and replace the battery:

  • Pull the latch end of the fob to release the key.
  • In its place, you should see a slot at the end of the fob casing.
  • Insert the key here to open the battery compartment.
  • Remove and replace the old battery after making sure it is facing the right way.

Experience Affordable Mercedes-Benz Service Cost at Mercedes-Benz of Bloomfield Hills

Need help replacing your key battery, or have questions about other car-care issues like jump-starting a dead battery? Our Bloomfield Hills service center can help you out with expert advice or perform the services you need at a reasonable price. Feel free to contact us with any questions, and be sure to check out our service specials before booking your appointment!

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