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

Ever found yourself stranded with a dead battery in your Mazda key fob, unable to unlock or start your car? Frustrating, right? Well, worry no more! In this article, you’ll discover the simple steps to replace the battery in your Mazda key fob all by yourself.

Have you ever panicked when your key fob started acting up, leaving you wondering if it’s time for a costly trip to the dealership? We’ve all been there. But fear not, as with our easy-to-follow guide, you’ll be a pro at changing your Mazda key fob battery in no time.

Gather Necessary Tools

To replace the battery in your Mazda key fob, you’ll need a few essential tools. Here’s what you’ll need:

  • Flathead screwdriver: To pry open the key fob.
  • Small coin or flat tool: For opening the key fob without damaging it.
  • Replacement battery: Make sure you have the right type based on your Mazda key fob model.
  • Tweezers: Handy for removing the old battery and placing the new one securely.
  • Cloth or tissue: To keep your hands clean during the process.

Once you have these tools ready, you’re all set to proceed with replacing the battery in your Mazda key fob.

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Identify the Key Fob Model

To begin the battery replacement process for your Mazda key fob, the first step is identifying the specific model of your key fob. This is crucial as different Mazda key fob models may have varying methods to access and replace the battery. Here’s how you can easily identify your key fob model:

  • Look for the Mazda logo: The front or back of your key fob usually features the Mazda logo. Take a moment to locate this logo as it can help in determining the model.
  • Check the key fob size: Mazda key fob models can differ in size and shape. Compare your key fob’s size and form with reference images to narrow down your model.
  • Review the owner’s manual: If you have access to the owner’s manual of your Mazda vehicle, it often contains detailed information about the key fob model and battery type required.
  • Visit a Mazda dealership: If you’re unsure about your key fob model, visiting a Mazda dealership with your key fob can help in identifying the exact model for a smooth battery replacement process.

Once you’ve successfully identified your Mazda key fob model, you’re ready to move on to the next steps of replacing the battery.

Open the Key Fob

When it’s time to replace the battery in your Mazda key fob, the first step is to open the key fob carefully. Here’s how you can do it:

  • Look for a Notch: Start by inspecting your key fob for a small notch along the seam. This notch is designed for opening the key fob without causing damage.
  • Use a Flat Tool: Grab a flat tool like a small screwdriver or a coin to pry open the key fob. Insert the tool into the notch and gently twist to separate the key fob casing.
  • Mind the Buttons: As you open the key fob, be mindful of any buttons or components that might fall out. Keep track of their position to easily put them back later.
  • Separate the Halves: Once you have successfully opened one side of the key fob, carefully separate the two halves. Take note of how the parts fit together for reassembly later.
  • Access the Battery: With the key fob open, you can now access the battery compartment. Identify the battery type needed for replacement by checking the number on the old battery or referencing the owner’s manual.
  • Inspect for Damage: While you have the key fob open, take a moment to inspect the interior for any signs of damage, such as corrosion or loose connections. Address any issues before proceeding with the battery replacement.

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Exploring the insides of your Mazda key fob can be an interesting and rewarding experience. Now that you’ve successfully opened the key fob, you’re one step closer to replacing the battery and restoring full functionality.

Replace the Battery

To replace the battery in your Mazda key, you’ll need to follow a few simple steps to ensure a smooth process. Here’s a guide on how to do it effectively:

  • Step 1: Locate the Battery Slot

  • Look for the battery compartment on your Mazda key fob. It’s usually on one of the sides.
  • Step 2: Remove the Old Battery

  • Use a small flathead screwdriver or a coin to carefully pry the old battery out of its slot. Be gentle to avoid damaging the casing.
  • Step 3: Insert the New Battery

  • Take the new battery and place it into the compartment with the correct side facing up. Ensure it fits snugly.
  • Step 4: Close the Casing

  • Gently press the two halves of the key fob together until you hear a click, indicating that it’s securely closed.
  • Step 5: Test the Key Fob

  • Test your key fob to make sure the new battery is working correctly. Try locking and unlocking your car to confirm.

Battery Type: CR2025

Quick Tip:

If you’re unsure about which battery to buy, check your Mazda owner’s manual for the specific battery type recommended for your key fob.

Test the Key Fob

Now that you’ve replaced the battery in your Mazda key fob, it’s time to test if everything is in working order.

  • Check Range: Ensure your key fob works from various distances within range.
  • Test All Buttons: Press each button on the key fob to verify they function correctly.
  • Check Lock/Unlock: Test the lock and unlock buttons to confirm the key fob can control your vehicle’s locks.

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If the key fob is responsive and all functions work properly, congratulations – you’ve successfully replaced the battery in your Mazda key fob.


That’s it! You’re all set with a fresh battery in your Mazda key fob. Remember to test it out by checking the range and ensuring all buttons work smoothly. If everything’s in order, you’ve successfully completed the battery replacement process. Keep your key fob functioning at its best with this simple maintenance task. Happy driving!

Frequently Asked Questions

1. What type of battery does my Mazda key fob use?

Your Mazda key fob uses a CR2025 battery.

2. How do I replace the battery in my Mazda key fob?

To replace the battery, locate the battery slot, remove the old battery, insert the new CR2025 battery, and close the casing securely.

3. How can I test if the battery replacement was successful?

After replacing the battery, test the key fob by checking its range, testing all buttons, and ensuring the lock and unlock functions work properly.

4. Where can I find the correct battery type for my Mazda key fob?

Check your Mazda owner’s manual for the correct type of battery needed for your key fob.

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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