Yes I do understand you. And it is my long time worry as well. But... It is hard to get everythign in the size I want that would have one common battery source. I could have gotten a headlamp that uses AAs but it wouldn't be as small as ZIpka or Tikka. For now I keep AAs, AAAs and cr123s as primary source of power. At that's what is in my BOB. I'm pretty confident I can get my hands on AAs and AAAs; CR123 are my bigger worry. As my next to buy item on my list is a AA adapter for LS flashlight. Also you see a lot of things I have were gifts or items required by my corp. I had no saying in what I can get. A lot of times space we save on item size is gone when we need to carry parts for it. I agree that generators are over kill especially here in NYC but I have access to them and maintain them for my father so I may as well include them in the worst case scenario.

Matt