also: here have a bucket full of cockroaches the integer overflow bug on the cooling cells is even more reason to switch to NBT
If you log out with a hot cooling cell (right after crafting for example there is a integer overflow (looks like one to me anyway) when you log back in on the item
2 cell can craft together to 1 with the shapeless tool repair recipe.
edit: the integer overflow bug happens in reactors and chests too, not just player inventory