Mercedes-Benz Key Fob Battery Replacement

In this guide, you will find videos and instructions to help you replace the battery on all Mercedes-Benz keys.

If your Mercedes-Benz key buttons are broken, you don't need to buy a new key. In most cases, you can simply replace just the key shell. You can purchase a new Mercedes-Benz key shell (eBay link) online. 

Watch the video above or scroll down below to find step by step instructions. No programming is required when changing the Mercedes-Benz key fob battery.

How to change the battery on the Mercedes-Benz key?  TRIANGLE Panic Button

Battery size

• CR2025

Procedure

1. Remove the metal key from the keyfob. Slide the release at the end of the key to slide out the metal key.
2. Insert the metal key on the exposed slot to pry out the back cover of the key.
3. Use a small flathead screwdriver to pry out the battery.
4. Install the new battery in the key. The positive (+) sign needs to be facing out.
5. Press the back cover and metal key in the key.

How to change the battery on the Mercedes-Benz chrome key? 

Battery Size

• Two CR2025 batteries

Procedure

1. Slide the black tab to release the metal key.

2. Remove the metal key.

   
3. Use the metal key to unlock the key insert (the part inside the key that holds the batteries) and slide it out of the key.
4. Slide-out both batteries. Pay attention to the orientation of the positive (+) side of the battery.
5. Install the new batteries by sliding them in.
6. Slide the key insert into the key fob.
7. Slide the metal key into the key until it locks.

How to change the remote battery on a pre-2005 Mercedes-Benz? 

Battery Size

• CR2025

Procedure

1. Slide the release at the back of the key to removing the metal key.
2. Insert the metal key in the exposed gap to release the key insert (the part that holds the batteries).
3. As you keep the release pressed, slide out the inner part of the key.
4. Remove the batteries. Note the orientation of the positive side (+) of the battery.
5. Install the new battery. Slide the inner part back in the key. Slide the metal key back into the keyfob.

How to change the fob battery on pre-2000 Mercedes-Benz? 

This key is used in many models up to the model year 2000. It is also used in a few models after the year 2000, such as the SLK, ML, Sprinter, G models.

Battery Size

• CR2025 battery.

Procedure

1. Press the round chrome button to open the metal blade.
2. Use your fingers to pry out the back cover of the keyfob.
3. Remove the battery and install the new one. Pay attention to the (+) of the old battery. Install the new battery in the same orientation.
4. Press the back cover back on the keyfob.

What battery do you need for the Mercedes-Benz key fob? 

The most common battery used in Mercedes-Benz keys is a CR2025 battery. Battery size is listed below each key picture.