How to change the battery on the Mercedes Benz Smart Key Fob. How do you know you need a new battery? The remote lock or unlock range is poor. Or even worse, the door lock/unlock is not even working. These videos will show how to change the battery on different Mercedes-Benz Key Fob Remotes. There are several Mercedes Smart Key remotes, so look at the correct video.
We strongly recommend using a Lithium battery like these ones, as they last much longer.
First, you need to identify which key you have. There are several models. The current Smart key fob is the chrome key with a triangle panic button.
If your buttons are worn out, consider adding a silicone case to avoid further damage to your key. You can get a cover case for less than $10, see here.
How to replace/change Mercedes Key Fob Batteries
1. Current Chrome Key
Triangle Panic Button
It requires ONE CR 2025 battery.
2. Chrome Key
Round panic button
3. Older Smart Key Fob
Black Plastic Housing
Requires TWO CR 2025 batteries
4. First Model Smart Key Fob Remote
Oldest Smart Key Black Plastic Housing
Requires two TWO CR 2025 batteries