I agree, but the challenge is that eventually, always, if I know that thing is in there and for some reason I need one, I will absolutely raid it instead of goi

I agree, but the challenge is that eventually, always, if I know that thing is in there and for some reason I need one, I will absolutely raid it instead of going without (rationally I think). Once you allow for that eventuality, you either have to remember to recharge it and put it back every time or buy so many its unlikely you will ever run low enough to need to raid it. I would rather just buy something that couldn't be raided without ruining it or is otherwise unfeasible to use as a replacement for other things, like a large permanently installed battery in a suitcase.