If replacing the battery by yourself follow the instruction.
Mazda car key battery.
Press the knob and pull out the auxiliary key.
Twist a tape wrapped flathead screwdriver in the direction of the arrow and open the cover slightly.
Release the latch and pull down.
If your key fob battery is dead simply follow the steps below to unlock and start your mazda.
Replacing the battery at an authorized mazda dealer is recommended to prevent damage to the key.
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Turn the key over find a small latch on the back.