BMW Key how to change battery: A Step-by-Step Guide

Introduction || BMW Key how to change battery

Maintaining a functional BMW key fob is crucial for seamless vehicle access and operation. Over time, the battery within the key fob may deplete, rendering it unresponsive. Replacing the battery is a straightforward process that can be accomplished with minimal tools and expertise. This comprehensive guide will equip you with the necessary knowledge and instructions to effortlessly change the battery in your BMW key fob.

Tools and Materials Required

Before embarking on the battery replacement procedure, ensure you have the following tools and materials readily available:

  • New CR2450 battery
  • Small flathead screwdriver
  • Clean cloth

Step-by-Step BMW Key how to change battery

  1. Locate the Key Release Button: Begin by identifying the small button located on the side of the key fob, typically near the top. This button serves as the release mechanism for the mechanical key.
  2. Remove the Mechanical Key: Press and hold the key release button while simultaneously pulling the mechanical key outwards. The mechanical key should slide out effortlessly.
  3. Pry Open the Battery Cover: Locate the small notch or tab situated where the mechanical key was previously inserted. Using the flathead screwdriver, gently pry open the battery compartment cover.
  4. Remove the Old Battery: Once the battery compartment is accessible, use the flathead screwdriver to carefully pry out the old battery. Exercise caution to avoid damaging the battery or surrounding components.
  5. Insert the New Battery: Take the new CR2450 battery and align it with the positive (+) and negative (-) markings inside the battery compartment. Ensure the battery is firmly seated and does not rattle.
  6. Close the Battery Cover: With the new battery securely in place, carefully press the battery compartment cover back into position. Ensure it clicks securely into place.
  7. Reinsert the Mechanical Key: Slide the mechanical key back into its designated slot until it clicks securely into place.
  8. Test the Key Fob: To verify that the battery replacement was successful, press any button on the key fob. The key fob should respond promptly, indicating that it is now powered by the new battery.


1. How often should I replace the battery in my BMW key fob?

The frequency of battery replacement depends on your usage patterns. However, a general guideline suggests replacing the battery every two to three years.

2. What are the signs of a low battery in my BMW key fob?

Common signs of a low battery include reduced responsiveness of the key fob buttons, a shorter range for unlocking or locking the vehicle, or intermittent operation of the key fob.

3. Can I use a different type of battery in my BMW key fob?

The recommended battery for BMW key fobs is a CR2450 battery. Using a different battery type may result in improper operation or damage to the key fob.

4. Where can I purchase a CR2450 battery?

CR2450 batteries can be readily found at most automotive stores, electronics retailers, and online retailers.

5. Can I have my BMW dealership replace the battery in my key fob?

Yes, BMW dealerships offer key fob battery replacement services. However, this service may incur additional charges.


Replacing the battery in your BMW key fob is a simple and straightforward procedure that can be completed with minimal tools and expertise. By following the instructions outlined in this guide, you can ensure that your key fob remains functional and responsive, providing you with continued access to your vehicle.


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