What distinguishes zinc-air hearing aid batteries from other types of batteries?

Batteries have protective stickers on the bottom.
After removing them, you should wait at least 2 minutes before placing the battery in the device.
This time is necessary for oxygen to penetrate the inside of the battery - only then does the battery activate and reach the appropriate voltage for operation.
Failure to follow these recommendations may result in a situation where the device considers the battery to be discharged, as it will not yet have the appropriate voltage.