How to Change a BMW Key Battery

It can be incredibly frustrating when you go to use your BMW key fob and the battery is dead. Fortunately, it is quite easy to replace the battery right at home. Wondering how to change a BMW key battery? Tulley BMW of Nashua has created this helpful guide, so you can get back on the road in no time. 

How to Change a Battery in A BMW Key Fob

Not sure how to open a BMW key fob and replace the battery? It really depends on the type of key fob you have. We will break down how to change a BMW key battery in several of the most common BMW key fobs below. 

Smart Key

1. Locate a new CR2450 battery.
2. Take out the metal key blade from the key fob.
3. Remove the back cover of your BMW key fob.
4. Carefully take out the old battery, and put the new battery properly in place.
5. Make sure that the key fob case is closed securely. 

Comfort Access BMW Key Fob

1. Locate a new CR2032 battery.
2. Press the small tab on the key fob to gain access to the valet key. 
3. When you take out the valet key, find the small access port. 
4. Use a flathead screwdriver or the valet key to remove the battery cover. 
5. Take out the old battery that no longer works, and put in the new battery correctly.
6. Make sure that the key fob case is closed securely. 

Note: If you were not able to open the key fob, it could be because your vehicle comes with the non-comfort access key fob. This type of key fob has a built-in rechargeable battery. Learn what to do in this case below. 

Non-Comfort Access BMW Key Fob

This type of key fob has a rechargeable battery, so you will not be able to open the key fob. When the key is inserted in the ignition, it charges the battery. If the battery no longer works, bring your key fob to our service center, and we can fix the issue for you. 

Sleek Slant Shaped Key Fob

1. Locate a new CR2032 battery.
2. Push the button to gain access to the valet key. 
3. You will find a small groove once you remove the valet key. Use the valet key to turn the groove clockwise.
4. Remove the battery cover using a small screwdriver. 
5. Take out the old battery and put a new one properly in place.
6. Make sure that the key fob case is closed securely. 

Diamond Key Fob

You are not meant to replace the battery in this type of key fob. It is possible, but it is not recommended by the manufacturer. The process involves cutting the case and soldering a new battery.

Contact Tulley BMW of Nashua for More Information

If you have additional questions about how to change a BMW key battery or how to open a BMW key fob, the team at Tulley BMW of Nashua is here to help. Contact us today for more information.