Battery: You can use a CR2032 or equivalent battery for the 2021 Mazda CX-3 key fob. The Mazda3 key fob battery should be similar as well.
How do you change the battery in a 2011 Mazda CX-9 key fob?
https://www.youtube.com/watch?v=nlTlPAMf3K0
What kind of battery does a Mazda CX 9 Key take?
How to replace the Mazda CX-9 2016, 2017, 2018, 2019 smart key fob battery. This smart key fob can easily be opened to replace the CR2025 battery inside.
How do you change the battery in a Mazda 2021 Key?
https://www.youtube.com/watch?v=x5xSpm_PPz0
What kind of battery goes in a Mazda CX 9 key fob?
Insert the new CR2032 battery in the key fob, facing the same direction as the old battery (positive side down). The two halves of the fob should easily snap back together.
Can I use a CR2032 in my Mazda key fob?
Registered. The key FOB comes with a CR2025 battery rated at about 163 mAh. You can replace it with a CR2032 which is rated at about 240 mAh.
What kind of battery is in a Mazda 3 key fob?
Take your replacement CR2025 battery—face up—and slide it up towards the red dot before pushing the bottom into place. Click the two halves of the key fob case back together. That's all it takes, you're done.