Can’t unlock/lock your Mercedes-Benz due to a dead key fob battery? Learn how to fix the problem by replacing the dead battery on your Key Fob.
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 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.
Video
How to change the battery on the Mercedes-Benz key? TRIANGLE Panic Button
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Battery size
- CR2025
Procedure
- Remove the metal key from the keyfob. Slide the release at the end of the key to slide out the metal key.
- Insert the metal key into the exposed slot to pry out the back cover of the key.
- Use a small flathead screwdriver to pry out the battery.
- Install the new battery in the key. The positive (+) sign needs to be facing out.
- Press the back cover and metal key in the key.
How to change the battery on the Mercedes-Benz chrome key?
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Battery Size
- Two CR2025 batteries
Procedure
- Slide the black tab to release the metal key.
- Remove the metal key.
- 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.
- Slide-out both batteries. Pay attention to the orientation of the positive (+) side of the battery.
- Install the new batteries by sliding them in.
- Slide the key insert into the key fob.
- Slide the metal key into the key until it locks.
How to change the remote battery on a pre-2005 Mercedes-Benz?
SaleBestseller No. 1
Battery Size
- CR2025
Procedure
- Slide the release at the back of the key to remove the metal key.
- Insert the metal key in the exposed gap to release the key insert (the part that holds the batteries).
- As you keep the release pressed, slide out the inner part of the key.
- Remove the batteries. Note the orientation of the positive side (+) of the battery.
- 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 has been 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, and G models.
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Battery Size
- CR2025 battery
Procedure
- Press the round chrome button to open the metal blade.
- Use your fingers to pry out the back cover of the keyfob.
- Remove the battery and install the new one. Pay attention to the (+) of the old battery. Install the new battery in the same orientation.
- 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. The battery size is listed below each key picture.
We hope you find the Key Fob Battery Replacement Mercedes-Benz guide helpful. Check these troubleshooting and repair guides for more help on your Mercedes-Benz.
My 2005 ML 350 used the pre-2000 flip key. The instructions work perfect to change batteries, thanks!! But, I did have to turn ignition forwards with key and then put key in driver door lock ( had to hold down lock button for 10 seconds while pushing unlock button 5 times). Doing this somehow syncs or re-synchronized my FOB and everything works beautifully! Don’t automatically assume something is wrong with FOB before re-synchronization, if necessary and best of luck!!