How to Disassemble and Replace the Battery in an Old Mazda 6 Key?

[MadelynDella]

First, press the silver button on one corner of the key to release the mechanical key; then use a small steel ruler to gently pry open the upper half of the key, separating the shell. Remove the old battery and install a new one. The battery model used is CR1620. When the car remote key runs out of power, you can use the mechanical key on the remote key as a backup to operate the vehicle.