CR2032 Battery Container for 10pcs by NerdCorner
Find out everything you need to know about the battery box on my blog: https://nerd-corner.com/3d-printed-battery-container-for-cr2032/ or https://nerd-corner.com/de/3d-gedruckter-batteriebehaelter-fuer-cr2032/
Is it air tight?
Unlikely, most 3D Prints would not be.
Makes sense. I guess it wouldn't matter. I've seen them sit in PCs for a decade and still hold enough charge to power the BIOS.