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

Ever found yourself stranded outside your car, desperately clicking your Mazda CX-5 key fob, only to realize the battery’s dead? Frustrating, right? But fear not, because in this article, you’ll discover a simple solution to this all-too-common dilemma.

Did you know that replacing the battery in your Mazda CX-5 key fob can be a quick and easy fix? No need to rush to the dealership or spend a fortune on replacements. With just a few simple steps, you can have your key fob up and running in no time.

By the end of this article, you’ll be equipped with the knowledge and confidence to tackle this task like a pro. Say goodbye to those panic-inducing moments of a silent key fob – you’ll soon be back on the road with ease.

Step 1: Gather the necessary tools

To get started on replacing the battery in your Mazda CX-5 key fob, you’ll need a few essential tools. Here’s what you should have on hand:

  • Replacement Battery: Check your Mazda CX-5 key fob for the type of battery it requires.
  • Small Flat-Head Screwdriver: This will help you open the key fob casing without causing any damage.
  • Clean Cloth: It’s always handy to have a cloth nearby to keep your work area tidy.
  • Optional: Tweezers: In case the battery is hard to remove, tweezers can provide extra assistance.

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Make sure you have all these items ready before you start the battery replacement process. It’ll make the task smoother and more efficient for you.

Step 2: Open the key fob

To open the Mazda CX-5 key fob, you’ll follow these steps:

  • Place your key fob on a flat surface with the buttons facing down.
  • Locate the small notch on the side of the key fob.
  • Insert the small flat-head screwdriver into the notch and gently twist to separate the two halves of the key fob.
  • Be careful not to apply too much pressure to avoid damaging the key fob casing.
  • Once the key fob is open, carefully remove the old battery using the clean cloth or optionally tweezers.

Before moving on to replacing the battery, ensure you handle the key fob components delicately to prevent any accidental damage.

Step 3: Replace the old battery

It’s time to replace the old battery in your Mazda CX-5 key fob. Follow these steps carefully:

  • Remove the old battery: Most key fobs use a coin cell battery. Pop out the old battery using a small tool like a screwdriver or tweezers.
  • Check the battery type: Before inserting the new battery, ensure it’s the correct type and size for your key fob.
  • Insert the new battery: Place the new battery into the designated slot with the correct polarity. It should fit snugly.
  • Test the key fob: After inserting the new battery, test your key fob to make sure it’s functioning correctly.
  • Reassemble the key fob: Carefully put the key fob back together, ensuring the pieces align correctly before snapping them into place.
  • Dispose of the old battery properly: Remember to dispose of the old battery in accordance with local regulations.

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Old Battery New Battery
CR2025 CR2032

Taking care of your key fob ensures its longevity and helps you avoid unexpected issues when using your Mazda CX-5.

Step 4: Reassemble the key fob

After replacing the battery in your Mazda CX-5 key fob, it’s time to reassemble it correctly to ensure everything functions as it should. Here are the steps to guide you through this process:

  • Line Up the Key Fob Components: Make sure the buttons and key blade are in their correct positions before putting the key fob shell back together.
  • Gently Press the Key Fob Shell: Be careful not to force the pieces together as you reattach the halves of the key fob.
  • Test the Key Fob: Press the buttons to ensure they work once the key fob is reassembled.

Remember, proper reassembly is crucial to the key fob’s functionality and longevity.

Step 5: Test the key fob

To ensure proper functionality, it’s essential to test your Mazda CX-5 key fob after replacing the battery. Here’s how:

  • Press each button on the key fob multiple times to check for responsiveness.
  • Confirm that the buttons unlock, lock, and open the trunk as intended.
  • If any button is unresponsive, try repeating the battery replacement process or consult a professional.

Remember, testing the key fob is crucial for long-term performance and convenience.


You’ve now successfully replaced the battery in your Mazda CX-5 key fob following the detailed steps outlined in this guide. By using the recommended CR2032 battery and ensuring proper reassembly, you’ve taken a proactive step in maintaining the functionality of your key fob. Remember to test all the buttons to confirm their responsiveness, guaranteeing smooth operation. Regular testing post-battery replacement is essential for the optimal performance and reliability of your key fob. Keep up with these simple maintenance practices to ensure that your key fob continues to serve you well in the long run.

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Frequently Asked Questions

Q: What type of battery should I use to replace my Mazda CX-5 key fob battery?

A: It is recommended to use a CR2032 battery for your Mazda CX-5 key fob.

Q: How should I reassemble the key fob after replacing the battery?

A: Align the components, gently press the shell together, and test the buttons for proper functionality.

Q: Why is it important to test the key fob after replacing the battery?

A: Testing ensures all functions work correctly, buttons are responsive, and the key fob functions properly for longevity.

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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