Advanced Bionics Naida CI M90 Manuel D'utilisation page 38

With the tool inserted in the hole, gently push in and downward until
you feel the Zn-Air drawer release and pop out the button of the Zn-Air
cartridge. If you do not have the tool present, any thin, pointed device
should work to release the drawer.
Set the tool aside. From here you can grasp the Zn-Air drawer with your
hand and gently pull it the rest of the way out, so you are able to insert
the Zn-Air cells.
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