Li-Ion battery hardcases in several sizes (18650, 21700, 32700, 40160) and configs

Been experimenting with Li-Ion, LiFePO4, and LTO-cells in different sizes, these are a few different holders I've whipped up over the years.

Some of these are quite quick'n'dirty slap-together-jobs, and might have duplicate faces from merges, etc.

Consider this a permanent work-in-progress, I have several more, but finding them in my project folders... Is the real project. 😅

21700: I usually just resize the 18650-holders by ~117% x 108% to fit 21700-cells. 32700: 18650-holders by ~178% x 108%