I would save as many as you can because they’re going to wear out. They’re made for one-time use.
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OKAY! Link at Amazon HERE.
This looks like it’d fit 312 and 13 batteries … but perhaps I’d have to trim the top sticky-tab off so they’d fit snug in the case. If I peel that sticky tab off, the batteries may start to discharge.
(EDIT: Note that LR41 batteries that fit the case shown here are NOT the same size as the 312 as indicated way down the article HERE)
To the laboratory! I’ll order one and try it out! 
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I use size 13 batteries and from the beginning wanted a case that I could have in my pocket that wouldn’t rattle. I did try a memory card case and that worked well, but have used a Duracell battery case for about a year. I haven’t noticed any loosening of the post but have a bunch as back ups.
I’ve tried to include some images here, but this is the first time that I’m trying to do that, so forgive me if it doesn’t work.
The first is of two 4 battery cases. If you look at the second of the two cases you can see that I’ve refilled it with 6 batteries and cut off the little plastic hanging loop. This fits nicely in my pocket. The second picture shows the 4 cell battery case along with a 6 cell battery case and also a AA battery for reference.
I apologise but the pictures are showing out of the order I wanted to but I think that you’ll ‘get the picture’.
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Right, those are all plastic. I was thinking of the cardboard cases with carousel.
These are THE BEST. I had no idea they were sold with just 4 batteries?!?
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I really like the 4 battery one it’s small enough to fit in my trouser pocket and also can be filled with 6 batteries. I’ve been using the same one for over a year now, with no rattling and no loosening of the prongs. I have been saving them as they are so well designed, so have quite a few backups.
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This what I’ve been using for the past 15 years or more, 312 fit and 13 fit also. Never had an issue, thin foam pad on the bottom prevents any slipping, and case is in my pocket no mater were I go, case is small memory card holder. Also have the magnet stick in case I need it and in the pouch the small probe to clear out the vent hole in my custom molds.
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What is the manufacturer? I can’t find this waterproof hearing aid battery storage device? Thank you
They are only available on eBay as it’s a guy from home just making them with a 3D printer.
Think he’s only sending to the UK.
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