Not sure if this is the right place to ask for weird gadgets or not but here goes anyways. 
I'm looking for what I call a micro generator. Basically a mini generator that runs off of a fuel like butane (good long term storage and cheep) but is supper small and only needs to output 12v max or 5v for usb (covers cell phones, ecig batteries and such).
This is not something I am in need of right now but I'v been looking for something along these lines for years to add to the family emergency supplies and thought I'd ask around again.
Originally thought of using a couple of generators for bicycle lights but could never find a tiny engine to run them other than the ones in model planes that need special fuel.
Any help or leads will be appreciated.
I'm looking for what I call a micro generator. Basically a mini generator that runs off of a fuel like butane (good long term storage and cheep) but is supper small and only needs to output 12v max or 5v for usb (covers cell phones, ecig batteries and such).
This is not something I am in need of right now but I'v been looking for something along these lines for years to add to the family emergency supplies and thought I'd ask around again.
Originally thought of using a couple of generators for bicycle lights but could never find a tiny engine to run them other than the ones in model planes that need special fuel.
Any help or leads will be appreciated.