uhm.. went thru with everything but drone batteries (didn't have drone yet) just this past june. Both in and out of coz. Also had no issues last September with a few less gopros but still plenty of spare batteries for dive lights and my gopro. Maybe I was lucky, maybe its because I took the time to package them right, I dunno.. Just relaying my experience.
Maybe it was just NiMH. I have gone through Coz several times with the batteries in the flash. This time I just had a 4 pack in the original packaging, like right off the shelf. Never opened and boom they found them and bye bye. I have had a spare camera battery for the Canon and it never was an issue. Maybe it is just AA they like?