I make it a point to have a few replacement batteries for all of my lights, optics, and shot timer. Up to this point, I keep them altogether in a ziplock baggy in a pocket of my range bag. I was looking for storage solutions and the Thyrm Cellvault XL could be a partial answer:
The Cellvault isn’t technically waterproof but I’m not diving with it so it’ll store batteries just fine for me. It looks like it’ll work great for AA/AAA, CR123, CR2, and smaller cells like 1/3N but I’m not certain it’s the answer for large coin-shaped batteries like the 2032 or the big rectangular 9v.
How are you storing your various batteries? Is the Thyrm Cellvault the best option?