Widex D-XP - Manual (Page 11)

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The battery
We recommend zinc-air batteries . Use a size 312 battery for the
hearing aid .
To obtain replacement batteries, please consult your hearing care
professional . It is important to take note of the expiry date and
the recommendations on the battery pack regarding disposal of
used batteries . Otherwise there is a risk that the battery life may
be reduced .
Inserting the battery
Before inserting a new battery into the hearing
aid, remember to remove the adhesive tab . Once
the tab has been removed, the battery will start
functioning after a few seconds .