The size is the whole point though. it already is powered by a bog standard 18650 in tyhe rounded section. the only thing is it's solered down and theres no accesws port. That's literally it.
My plan was cut the bottom plate in half just past the screws and stick a hinge and peg hook to it for a closure, then do a bit of soldering to make terminals that work. Should actually be easier and cheaper than buying and installing it into a different box.
cutaway the rounded side panel and hinge that is the other obvious option. I was hoping someone had already done it and might have pointers. DO NOT ATTEMPT THIS, IT DOESNT WORK is of course an excellent pointer as well.