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How long do unopened 675 zinc air batteries last.

A package I bought a couple of months ago has an expiration date of July 2023, I assume that the date errors on the side of earliest possible date the batteries will go bad rather than a more optimistic date.
 
A while ago I was forced to buy a package of sixteen. I don't use them that often, I only used two of them and when I wanted to use a third, all the others were bad. Don't recall but maybe 2.5 years I had the package.
 
Thanks much. Looks like those 40 packs won't be such a bargain after all.
 
The volume packs are aimed at hearing aid users who will go through one a week for each ear. Our cameras are much easier on batteries, generally.
 
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