How to Change Your Mercedes-Benz Key Battery

October 9th, 2018 by

Hand holding opened Mercedes-Benz Smart Key

When it comes time for a Mercedes-Benz key fob battery replacement, it may seem like a challenging task to tackle on your own. However, our team at Fletcher Jones Motorcars is here to prove that’s not the case! Learn how to change your Mercedes-Benz key battery below.

How to Determine Which Mercedes-Benz Key Model You Have

While all Mercedes-Benz need the same CR 2025 battery, the type of model you have will determine how many you’ll need and how to change the battery/batteries. First, you need to determine whether you have a Smart Key or a Chrome Key. Chrome Keys belong to newer Mercedes-Benz models and have a metal casing, while Smart Keys are usually made out of plastic. If you have a Chrome Key, you must determine whether your Chrome Key is an older or newer version; newer Chrome Keys have a triangular panic button and require one battery, while older Chrome Keys have a circular panic button and need two batteries. For Smart Keys, both old and new versions need two batteries.

How to Open a Mercedes-Benz Key Fob

For Chrome Keys, to open the key fob, pull down on the bottom tab of the key. The tab should be small, square-shaped, and silver. Then, pull back until the key releases on its own. When the key releases, there will be a small gap in the fob. Press the key into the flat, narrow end to unfasten the key’s cover.

Smart Key fobs can be opened from the latch at the end of the fob. Pulling the latch will cause the key to remove itself from the holder. There should be a slot at the end of the key fob once the key is removed. Using the key, push into the slot. This will open the battery compartment.

When the cover of your key is off, you’ll see the old battery. Remove the battery, and dispose of it. Then, replace it with your new battery. Note: It’s important to make sure the new battery is facing the right way!

Learn More About DIY Mercedes-Benz Maintenance at Fletcher Jones Motorcars!

Contact our experts at Fletcher Jones Motorcars for information about where to buy a Mercedes-Benz key battery or key battery cost. We’re always happy to answer any questions you have, whether about our service specials or our DIY service tips, including how to unlock your Mercedes-Benz using your blade key and how to clean your leather seats!