Advanced Bionics Naida CI M90 Manuel D'utilisation page 37

Slide the battery onto the processor until you feel it click into place.
Inserting Zn-Air Disposable Battery Cells (Tamperproof
Cartridge)
Using the same tool provided for the M T-Mic or M Earhook removal
and replacement, insert the pointed end of the tool into the small hole
located on the spine of the Zn-Air cartridge.
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