So I bought a few of these for storing batteries within another container. I have 18650 and 26650 batteries that needed protection, as I didn't want them rolling around or bumping each other. When initially ordering, I thought they were bigger, but they turned out to be the perfect size. I can fit 4x 18650's in one, but it is very snug and doesn't feel like it would be a safe fit, so each one comfortably holds 2x 18650 or 1x 26650. I love that it is an actual protective case that seals, not just...