Come to think of it, I've always collected flashlights and with these new LED ones (and li-ion batteries) it's hard not to be interested in them. I have a stash of 14500 batteries so I have to put them to use. And it's not hard to find gear that is really good and cheap.

It's all these li-ion batteries that I've accumulated. You have a reusable power source so you can have the things associated with that. Basically, there's this whole modular "infrastructure" of USB and li-ion products that make it easy to consolidate items together under a defacto standard.