Seen a few ideas out there to carry batteries effectively through airport security in carry-on. My recent trip to Japan was plagued with small containers of batteries jiggling about in a small carry bag. I decided to do something about it.

The outer case is from Amazon. https://amzn.asia/d/0FsoNPo

I 3d printed the inner two sections in PETG or ASA (either/or - doesnt matter). Optimised for the range of batteries i may typically take with me. My camera batteries are in a different holder in my camera backpack.

I keep track of spent batteries by turning them upside down (-ve facing up).

The top section holds the random usb cables in have.

Much better than a bag of random boxes of batteries.

Nice box.... but for sure in Zurich / CH you will have some problems at the security check... that is to many batterie ... the rules are strict....

2 x 16 AA bat... is allready to much for a person. I was lucky to be with my wife I gave him one set... other wise ... :(

10 minutes ago, CaolIla said:

2 x 16 AA bat..

It might be hit and miss. I've travelled with a lot of batteries before and never had any confiscations... plenty of questions though.