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We have here car key that needs a new battery. This key is for Mazda, but several brands use similar keys.
The only tool that we need is a small flat head screwdriver.
Apply the screwdriver to open up the locking inside this groove.
Then you can pull the key into two parts.
The battery is located in this part with the buttons.
It's good to notice that the plus side of the battery is facing down, so let's put the new battery in the same way.
The battery has been replaced, so it's time to put the parts together.