Mazda MX-5 Miata Key Fob Battery Remote Replacement DIY Years 2006-2019

The Mazda MX-5 Miata is the best selling two-seat convertible of all time. This lightweight roadster was designed around the Japanese phrase—Jinba ittai—meaning oneness of horse and rider. This mantra can be felt through the vehicle’s impressive performance, neutral steering, 50:50 front to rear weight balance, and elegant design. Additionally, the Miata drew inspiration from the British sports cars of the 1950s and ‘60s adding to its sporty and classic appeal.

Between 2006 and 2015 the MX-5 Miata used the “flip” key fob with a folding internal key and remote locking, unlocking, trunk opening, and panic capabilities. Mazda switched over to the “smart” key in 2016 and hasn’t looked back since. With the “smart” key, users can lock, unlock, and push-to-start while the key is in their pocket. In this guide, we will walk you through a DIY battery replacement for both of these key fobs. Looking for a different Mazda key fob?

MX-5 Miata Smart Key 2016, 2017, 2018, 2019 CR2025 Check on Amazon
MX-5 Miata Flip Key 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 CR1620 Check on Amazon

How to replace the MX-5 Miata 2016, 2017, 2018, 2019 smart key fob battery

Scroll down to see a full video tutorial or read on for a step by step guide.

What you will need:
• 1x CR2025 battery
• Flat-head screwdriver

Changing the CR2025 battery in your Mazda MX-5 Miata smart key is a simple and quick process. First, push the tab the back of the smart key to remove the internal key. Look for the grooves on the left and right walls inside the area the key came just from. Insert the head of your flat-head screwdriver into each groove and twist. This will loosen the two halves of the smart key.

Now, the seams on the sides of the key fob should be coming apart. Insert your screwdriver into these seams, twist, and work your way down each side until the two halves come apart. Now that we are inside, the rest is easy. Remove the plastic disc battery protector with your fingers, and pull the CR2025 battery right out.

Position your new battery face up in the battery compartments. Next, put the plastic disc back on top of the battery, making sure the rubber band is in place. Finally, click the two halves of the smart key back together. Good job! Your MX-5 Miata key fob is now charged up and ready for use.

Mazda MX-5 Miata Smart Key Fob Battery Replacement (2016 - 2019)

This is the battery for this MX-5 Miata key fob:

Energizer 2025 Batteries, Lithium CR2025 Battery, 2 Count
  • Energizer 2025 Lithium Coin Battery
  • Delivers long-lasting, dependable performance in specialty devices like heart rate monitors, remotes, keyless entry systems, glucose monitors, toys, and games.Operating temperature:-30C to 60C
  • Holds power for up to 10 years in storage, ensuring you have Lithium Coin Batteries ready when you need them

GIF Visual Guide

In this video, I'm going to show you how to change the battery on your key Fob for a Mazda MX-5 Miata. This key Fob was used from 2016 to 2019. And inside you will find the CR 2025 battery that we will be replacing. So how to get in here? First turn it over, locate this little lever and push it down to release our valet key.

And now in this little opening there is a slot, a little indentation one on each side. And if you take a regular flathead screwdriver, you can just put it in there, give a little twist to make an opening and loosen it. We're going to do the same on the other side. It just finds its way into that little opening. And if you twist, you've loosened it now so we can safely move down that opening.

Twisting, twisting. To release this.

And now the battery is going to be under this little piece of plastic. You can just remove it like that. Slide out your battery. The 2025, go ahead, grab a replacement, slide it in the same way. Secure it with this piece of plastic protector right on top and take your back, line up the edges and just click it back into place and you're all set.

You can just put your key back in and you're done. However, if you didn't have a screwdriver on hand, it is pretty easy to get in here. Using similar method. You can just find this little groove and with your fingers up at the corner here, very easily make another opening. Do the same on the other side.

Just using your fingers, pop that out. And now with your valet key you can kind of use it as a tool. Put it in just like so hold the front part of the key with your fingers, hold the valet key and twist. Now you've opened it up, you have access to the battery and you replace the battery just like we saw before. Click it back in and you're good to go.

We have a new battery and you can go drive your MX-5 Miata.

How to replace the MX-5 Miata 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 flip key fob battery

Scroll down to see a full video tutorial or keep reading for a step by step guide.

What you will need:
• 1x CR1620 battery
• Flat-head screwdriver
• Precision screwdriver (3.0mm/PH0 or smaller)
• Pen, pencil, toothpick or another thin tool

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First, let’s open up our flip key fob. Start by locating the compartment where the folding key is housed. On the roof of this compartment is a seam between the two halves of plastic. You can use your fingers or a flat-head screwdriver to push upwards on the outer edge of the plastic. Push up until there is a bit of space between the two halves of the fob. Now, you should be able to fit a flat-head screwdriver into the opening on the bottom of the device (where the two holes for the keyring are). Give the screwdriver a twist and the whole key fob should open.

Next, take your precision screwdriver (3.0mm/PH0 or smaller) or another small tool and insert it into the top-right corner of the compartment that holds the battery. Pry the battery out with a rocking motion and slight pressure. If done correctly, the battery should come loose easily.

Position your new battery in place, face down. Push down until it clicks securely into the compartment. All that’s left is to reconnect the two halves of the flip key fob. Well done, you have a brand new battery in your Miata key fob.

Mazda MX-5 Miata Flip Key Fob Battery Replacement (2006 - 2015)

This is the battery for this MX-5 Miata key fob:

Amazon Basics 2 Pack CR1620 3 Volt Lithium Coin Cell Battery
  • IN THE BOX: 2-pack of CR1620 3 volt lithium coin cell replacement batteries for small electronic devices
  • DEVICE COMPATIBLE: Ideal for watches, calculators, games, medical devices, and more
  • DESIGNED TO LAST: Long-lasting, reliable battery life; performs in extreme temperatures

GIF Visual Guide

Hello everybody. Today I will show you how to change the battery on this key Fob. Here inside, we will find a Cr 1620 battery. This Fob was used on the Mazda MX-5 Miata specifically from 2006 to 2015. So if you have this key, just follow along.

I'm going to grab a flathead screwdriver and right on the inside where the key came from, you'll see a little separation between the piece of plastic. You can see the light reflecting off of it there. If you go ahead and hold this top part that won't move, hold it securely and push up. And we can see this whole piece of plastic is starting to come out, push up. And once you have a bit of separation on the bottom, you can use your screwdriver to put it in, rotate and make some more separation enough that we can remove it with our fingers.

Put that down for now. Here is our 1620 battery, and it's in there pretty solidly. You can't take it out with your fingers. So we're going to enlist the help of a little precision screwdriver. You can get these for just a couple of bucks online from Amazon.

Give you a link if you want to get one of these tools. If you needed to, you could use a pen. It's a bit more difficult or just another thin object that can fit right into this corner here. If you can see there's a little arrow on the bottom right corner with the key facing down, bottom right corner, we're going to insert a tool in between the battery and the plastic, push it down to the bottom and just sort of rock and pry until the battery pops out. Okay, once more, if I can put that back in bottom right corner, your tool push it and rock till you catch the edge of the battery and it pops out.

Get a brand new 1620 and come and replace it. Make sure that the side with the brand information and the battery information goes down. That's the positive side that goes down like so. And if you slide it up first, letting the top part get into its place where this metal is, and then just push on the bottom, you'll see it slides right in, back in its place. And you can reattach this other piece of plastic.

Make sure it all lines up and you're good to go. Your battery is fresh and ready. Go for a drive. So thank you so much for watching.

Mazda MX-5 Miata Parts

Find parts for your Mazda MX-5 Miata: