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How To Replace A Mercedes-Benz Car Key Fob Battery?

Your car key’s battery likely needs to be changed if it is no longer functioning properly. Are the doors on your Mercedes-Benz vehicle not locking or unlocking properly? It’s time to change the battery in your Mercedes-Benz key.

This article explains how to open your Mercedes-Benz key fob, how to change the battery in your Mercedes-Benz key fob, and how to determine when you need a key fob battery replacement.

Which Type of Mercedes-Benz Car Key Fob Do I Have?

Depending on the kind of key you have, you may need a certain number of batteries. The Chrome Key is one variety of key fobs. This key is for more recent Mercedes-Benz models and has a metal casing.

The Chrome Key is available in two variations as well: a newer version and an older version. The older version requires two batteries, while the newer version only requires one.

Take note of the panic button’s appearance to determine which Chrome Key you possess: the older panic button on older Chrome Keys is circular, while the newer Chrome Keys have a triangular panic button.

The SmartKey is a different kind of key fob you might have; it’s designed for older Mercedes-Benz models. Typically made of plastic, this key requires two batteries.

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When Should A Mercedes-Benz Key Fob Battery Be Replaced?

How can you tell if your Mercedes-Benz key fob battery needs to be changed? You’ll first notice a few warning signs if you need to replace the car key battery:

  • Your key battery may be low if you notice that starting your car takes more effort and more attempts.
  • You are no longer able to lock and unlock your doors. The panic alarm won’t go off, can you hear that? Those could be unmistakable indications that it’s time to replace the battery in your Mercedes-Benz key.
  • You might need a new key battery if a warning light on your dashboard indicates that there is an issue with your charging system.

Any of these symptoms may be a sign that it’s time to replace the battery in your Mercedes-Benz key. To avoid being stranded in North Las Vegas, we advise performing a car key battery replacement as soon as possible.

How To Replace A Mercedes-Benz Car Key Fob Battery?

Determine Key Type

Make sure you have a SmartKey or Chrome Key before changing the battery. The majority of vintage Mercedes-Benz vehicles are connected to a SmartKey®. It is plastic instead of metal like the Chrome Key.

You have a Chrome Key if your Mercedes-Benz key fob is metal-cased. Check the panic button to see if your Chrome key is brand-new or outdated. Is it triangular (new) or circular (old) in shape?

Choose The Right Batteries

Both the older Chrome Key and a SmartKey need two CR 2025 batteries. The more recent Chrome Key only needs one.

Replace A Mercedes-Benz Chrome Key Fob Battery

  • The silver, square-shaped tab on the key’s bottom must first be pulled downward. Pull it until it gives way.
  • You’ll notice a tiny gap in the fob once the tab has been separated. To open the key cover, insert the key into the flat, slender end of the fob.
  • A new battery should be installed in its place after the old one is removed. Verify that the new battery is facing the appropriate direction.

Replace A Mercedes-Benz Smart Key Fob Battery

  • The key should automatically come out of the fob when you pull on the latch end.
  • There will be a visible slot at the key fob’s end once the key is released.
  • To open the battery compartment, insert the key into this slot.
  • Make sure the new battery is facing the proper direction before replacing the old one.

What Should You Do If Your Brand-new Mercedes-Benz Key Fob Battery Isn’t Working?

You may need a new key if your Mercedes-Benz key fob still doesn’t seem to be functioning properly after you’ve learned how to change the battery. We can examine your key, evaluate its state, and, if required, order a new Mercedes-Benz key fob for you to use.

In general, the cost of new key fobs begins at just under $200. Often, the total price will be closer to $350 or $400 once the key is programmed and synced with your vehicle.

Even though the procedure is quick and simple, we always advise that you change the battery in your Mercedes-Benz key fob before making any assumptions.

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