Mazda 3 Key Fob Battery Replacement (2004-2018): How to Replace Mazda 3 Key Fob Battery?

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It can be frustrating when you have to replace the battery in your Mazda 3 key fob. How do I know if my Mazda 3 needs a new battery? How do I change the battery on my Mazda 3 key fob? How much does a Mazda 3 key fob cost? These are all questions that we will help answer here so you don’t have to worry about it anymore.

Please remember that the Mazda key fob battery replacement can be different for each model of car. If you have a newer year model then it may not match up with this guide as well as those from previous years.

If your key fob has stopped working or only works when you are right next to the car, then it is time to change the battery.

You don’t want to let it get too low before you change it because then your key fob won’t work at all and will need a new one which can be expensive depending on if you have an old or newer model of Mazda 3.

Read on for more details! To replace the battery.

Related Post:

Mazda 3 key fob battery type: What kind of battery does a Mazda 3 key fob use?

The Mazda 3 key fob needs different kinds of batteries for different models. The first one is the CR2025, which you need for models from 2004-2008 and 2014-2018. The second battery you need is the CR1620, which fits models from 2010-2013. They are about $1 each and can be found at most stores that sell batteries.

Key Fob Type Model Year Battery
Rectangular Mazda 3 2004, 2005, 2006, 2007, 2008 CR2025
Flip Mazda 3 2010, 2011, 2012, 2013 CR1620
Smart Key Mazda 3 2014, 2015, 2016, 2017, 2018 CR2025

How much does a Mazda 3 key fob battery cost?

It’s hard to find the right Mazda 3 key fob battery.

There are a lot of companies that sell batteries for your Mazda 3, but it can be difficult to figure out which one is best for you.

We’ve done all the research and found that this company has the most affordable prices on their batteries. They also have great reviews from customers who say they’re easy to install and last a long time.

You can find CR2025s at most stores that sell batteries. These are usually found in grocery stores, department stores, and drugstores. The cost is different depending on the brand: it costs around $2 to $5 for a CR2025 battery.

For CR1620s, you can find them in most places where they sell batteries or from specific companies that only sell them. They cost about $1 each.

What happens when the key fob battery is low?

If you use your key fob to unlock the car, it will tell you when it is low on battery. It may show a green light on the dashboard or it may not. Older cars might not have this indicator at all.

You will probably notice that your keyless unlocking doesn’t work as well when the battery is low.

The key fob has a life of 1-2 years depending on what type of key fob you have and how often you use it.

If you keep it close to your car, you’ll find that the keyless type stays active and drains the battery.

If you don’t want this to happen, make sure that you are at least 30 feet away from your car before using the remote/keyless type of key fob since they stay active for about 30 seconds after being used so they can tell if they worked or not.

Another thing is to keep your key fob away from other electronic devices so they don’t drain the battery any faster than it normally would.

How to replace Mazda 3 key fob battery?

If your car’s doors won’t lock or unlock, or you have to press the buttons more than once on the key fob, then it might be time to replace your key fob battery. Some cars will have a warning light that tells you when the battery is about to die.

However, the battery in your Mazda 3 key fob is dead and you don’t know how to replace it.

You’re not the only one who has been there. It’s a common problem that can be solved with just a few simple steps.

Here are easy ways to replace the battery in your Mazda 3 key fob.

What You Will Need:

  • Your key fob.
  • A tape-wrapped flathead screwdriver.
  • A replacement battery.

Step By Step Procedure of Mazda 3 Key Fob Battery Replacement

Do you have a small flathead screwdriver? Do you have a new CR2025 battery? And do you have your key fob with the old battery? If so, before you start changing the battery in your key fob, make sure that it is wrapped with tape to prevent scratches.

Now, you are ready to begin the replacement procedure!

  • Opening the Key Fob Case

These are the same steps for any of the three Mazda key fobs.

Step 1: Press the button on your keyfob that has an “Auxiliary” label next to it. You should find this button on the back of your keyfob under a cover near where you hold it when you’re using it.

Step 2: Remove the metal key with an “Auxiliary” label from your fob by twisting and pulling gently at both ends until it comes out of its slot in one piece.

Step 3: You will need to use either something flat or pointy like a screwdriver or pen to twist open one side of your case after you have turned off all power, so be careful! The slot for the rectangular keyfob is on the bottom near the key ring.

Step 4: You should now be able to separate the case. Place the case aside for now.

Step 5: Remove the battery cap by gently pulling it off of its plastic mount with a small, sharp object such as a pen or screwdriver.

Please note there is no need to remove the top cover of the fob, it can be ignored and should not be taken apart. Modification is not necessary either.

  • How to Replace the Battery in a Smart Fob (2014-2018 Mazda Vehicles)

If you have a Mazda 3, you need to replace the battery in your key fob. It’s easy! All you need is a CR2025 battery for model years 2014-2018.

Step-01: Remove the old battery from your key fob by using your fingers or nail clippers- be careful not to puncture the plastic.

Step-02: Place the new battery with its face up and put it into the place where the old one was.

Step-03: Snap or screw on the cap back on.

Step-04: Put together both pieces of your key fob cover onto it, then reinsert the metal key back in place too!

Step-05: Test to see if it locks and unlocks your doors.

Step-06: Done. Now get back to living life with your newly refreshed smart key fob.

  • How to Replace the Key Fob Battery on a Flip Fob (2010-2013 Mazda Vehicles)

To replace the battery on your Mazda Flip key fob, you need to change it. You’ll need a CR1620 battery for the flip key fob for model years 2010-2013. A 3.00mm or smaller precision screwdriver, a toothpick, or another tiny tool is all required.

Step-01: Find the square compartment that contains the battery

Step-02: Find the small triangle that points to bottom-right

Step-03: Press down on it and pry out the battery with a rocking motion

Step-04: Place the new CR1620 in the compartment, face down. Click it into place

Step-05: Snap key fob together, test to ensure key fob locks and unlocks doors successfully.

  • How to Replace the Key Fob Battery on a Rectangular Fob (2004-2008 Mazda Models)

Your key fob battery is dead and you’re not sure how to replace it.  Our replacement guide walks you through every step of replacing the battery in your 2004- 2008 Mazda 3 key fob.

Step-01: First, you need to take the screwdriver and push it on top of the battery near the red dot. Push hard until it pops out.

Step-02: Next, put a new CR2025 battery in your key fob, making sure that it is facing up with the correct polarity. To do this, slide the battery over to where there is a red dot and then press down until it snaps into place.

Step-03: Lastly, snap together your two sides again and test to see if your doors lock and unlock.


Whether you’re a DIYer or not, we hope that this article has helped to answer your questions about how to replace the battery in your Mazda 3 key fob. We know that sometimes it can be challenging finding the right information and getting started on a project like this one. If you need any help with these steps (or anything else related to car maintenance), let us know! Our team of experts is happy to assist by answering any questions, providing guidance along the way, or even completing some tasks for you if needed.


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