How to change the battery in a Mercedes key fob in 8 easy steps!

How to change the battery in a Mercedes key fob in 8 easy steps!

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If you own a Mercedes, then you know that the key fob is an important part of the car. The key fob helps you to lock and unlock your doors, as well as start the ignition. But what happens when the battery in your Mercedes key fob dies? This can be a frustrating experience, but don’t worry – changing the battery in your Mercedes key fob is actually quite simple. In this blog post, we’ll show you how to change the battery in a Mercedes key fob in just a few easy steps. So if your key fob’s battery has died, read on to find out how to replace it!

How to change the battery in a mercedes key fob:

Replacing the battery in a Mercedes key fob is a simple process that can be completed in just a few minutes.

Mercedes key fobs use a CR2032 or CR2025 battery, which is a small, round battery that is available at most stores. When replacing the battery in a Mercedes key fob, it is important to make sure that the new battery is inserted in the correct orientation. The positive side of the battery should be facing up, and the battery should be inserted into the key fob until it clicks into place.

  • Open the key by gently pushing down on the upper case and rotating it counterclockwise.
  • Lift the upper case off of the key.
  • On the back of the key, unscrew the battery cover by turning it counterclockwise.
  • Remove the old battery and insert a new  battery, making sure the battery is facing the correct way.
  • Screw the battery cover back on by turning it clockwise.
  • Replace the upper case of the key by fitting it over the key body and pushing it down until it snaps into place.
  • Push the key fob into the hole on the front of the Smart Key until it clicks.
  • The key is now ready to use.

How many batteries does the Mercedes Benz key fob need?

The number of batteries that you need depends on the type of keychain. A Chrome Key is for newer Mercedes-Benz models. There are two versions of Chrome Key: a newer model that needs one battery and an older one which requires two.

To determine what type of Chrome Key have, take note on how the panic button looks: oldest ones have a circular panic button and newer models sport one that’s triangular.

The other type of key fob you may have is the SmartKey®, which is made for older Mercedes-Benz models. This key is usually made out of plastic and needs two batteries.


If you have a Mercedes key fob and the battery dies, there is no need to panic. You can easily change the battery yourself following these simple instructions. All you need are about 5 minutes of your time. Have any questions? Contact Desert Ridge locksmith for assistance!