How to Replace Mazda CX-5 Key Fob Battery: Step-by-Step Guide

Ever found yourself locked out of your Mazda CX-5 because of a dead key fob battery? Frustrating, right? Don’t worry, we’ve all been there. But what if I told you that replacing the key fob battery is easier than you think? Imagine the convenience of doing it yourself without the hassle of a trip to the dealership. In this article, we’ll walk you through the simple steps to replace the key fob battery in your Mazda CX-5.

Mazda CX-5 Key Fob Battery Replacement

So, it’s time to replace your Mazda CX-5 key fob battery. Let’s dive in:

  • What You’ll Need:
  • New CR2025 battery
  • Small flathead screwdriver
  • Step 1: Locate the Battery Compartment:
  • Look for a small notch on the back of your key fob.
  • Step 2: Open the Case:
  • Insert the screwdriver into the notch and gently twist to open the case.
  • Step 3: Remove Old Battery:
  • Take out the old battery and dispose of it properly.
  • Step 4: Insert New Battery:
  • Place the new CR2025 battery into the slot with the positive side facing up.
  • Step 5: Close the Case:
  • Gently press the two halves of the key fob together until you hear a click.
  • Step 6: Test the Key Fob:
  • Check if the key fob is working by pressing the buttons.
  • Bonus Tip:
  • Keep spare batteries on hand to avoid being locked out unexpectedly.

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Step 1: Gather the Necessary Tools

To begin the key fob battery replacement process, ensure you have the following tools ready:

  • New CR2025 battery
  • Small flathead screwdriver

Having these tools handy will make the replacement procedure smooth and efficient.

Step 2: Open the Mazda CX-5 Key Fob

To open the Mazda CX-5 key fob, you’ll need to locate the small indentation on the side. Press the release button while sliding the cover off. Once you’ve done this, you’ll have access to the key fob battery.

With the cover removed, carefully pry out the old CR2025 battery using a small flathead screwdriver. Take note of the battery’s position to ensure the new battery is inserted correctly.

When handling the key fob, be gentle to prevent any damage to the internal components. Avoid using excessive force when opening the fob to prevent breakage.

Ensuring you perform each step correctly will guarantee a successful key fob battery replacement for your Mazda CX-5. Remember to keep track of the components and the way they are positioned as you progress through the process.

Step 3: Replace the Battery

Now that you have successfully opened the key fob, it’s time to replace the battery. Follow these steps carefully:

  • Remove the old battery: Use a flathead screwdriver to gently lift out the old CR2025 battery.
  • Pay attention to its position: Note how the old battery is placed to ensure the correct orientation when inserting the new one.
  • Insert the new battery: Place the fresh CR2025 battery in the same position as the old one. Ensure it is securely in place.

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Remember, proper handling is crucial to avoid any damage to the key fob components. Stay focused on the task at hand and proceed with patience.

Step 4: Test the Key Fob

Now that you’ve successfully replaced the battery in your Mazda CX-5 key fob, it’s time to test it to ensure everything is in working order. Here’s a quick guide on how to do it:

  • Go to your Mazda vehicle and make sure the doors are unlocked.
  • Press the buttons on the key fob to check if it’s responding as expected.
  • Listen for the sound of the doors locking and unlocking, confirming that the signal is being properly transmitted.

Remember, testing the key fob is an essential step to guarantee that your efforts in replacing the battery have been successful. If you encounter any issues during testing, double-check the battery installation and try again.


That’s it! You’ve now successfully replaced the key fob battery for your Mazda CX-5. Remember to test the key fob to ensure everything is working smoothly. If you encounter any issues during testing, refer back to the troubleshooting steps provided. Taking care of your key fob battery is essential for ensuring your vehicle’s security and convenience. Keep up the good work, and don’t hesitate to reach out if you need further assistance. Happy driving!

Frequently Asked Questions

1. Why is it important to test the key fob after replacing the battery?

After replacing the battery, testing the key fob ensures its proper functionality. This step confirms that the new battery works and the key fob can communicate with the car.

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2. How do I test if the key fob is working correctly after a battery replacement?

To test the key fob, ensure the car doors are unlocked, press the buttons to check responsiveness, and listen for the sound of the doors locking and unlocking. These steps verify the successful replacement of the key fob battery.

3. What should I do if the key fob does not work after changing the battery?

If the key fob does not function after battery replacement, try replacing the battery again to ensure it was installed correctly. If issues persist, consult the troubleshooting steps provided in the article for further assistance.

Battery industry professional with 5+ years of experience. Bachelor of Science in Electrical Engineering from Georgia Tech. Specializes in power systems and renewable energy.

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