Can AG13 LR44 alkaline batteries, SR44 357 silver batteries be interchangeable with 675 PR44 hearing batteries?

The AG13 alkaline batteries, SR44 silver batteries and 675 zinc-air hearing aid batteries have the same dimensions, i.e. 11.6 x 5.4 mm.

Zinc-air batteries have a capacity many times higher than alkaline and silver batteries of the same size, they use a unique technology where oxygen absorbed from the atmospheric air is used for a chemical reaction. These batteries have special stickers, the removal of which triggers the activation process. From this point on, there is also a gradual loss of battery capacity. The hearing battery discharges itself within 2-3 months after the removal of the protective sticker, even when it is not used. On the other hand, the use of an alkaline or silver battery instead of a zinc-air battery in a hearing aid will mean a very short operating time - often not exceeding a few hours.
The answer is "YES", the use of zinc-air batteries 675 interchangeably with alkaline batteries AG13 or silver SR44 / 357 batteries is theoretically possible, but usually not very comfortable and suboptimal.

In practice, it is not worth installing a hearing (zinc-air) battery, e.g. in watches, remote controls, calculators, toys, where we replace batteries very rarely - e.g. once every few weeks. However, if our device works very briefly on alkaline batteries (e.g. a few hours, or a maximum of a few days), and the battery compartment is not completely tight, the zinc-air battery will provide a significantly longer operating time.

The use of AG13 or SR44 batteries in a hearing aid may also be justified, but only in exceptional circumstances - e.g. in an environment with high humidity (e.g. a swimming pool), where zinc-air batteries do not work optimally. Remember, however, that neither alkaline nor silver batteries are designed for use in hearing aids, sound processors or implants - zinc-air batteries should be used in everyday use.

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