Yeah, but in the order of "tinyness" there is only so much you can do with batteries, so the solution is the mini USB port and a carrying pouch for 2 ecig bats and 2 carts. This would give you 1080 Mah in total and should get you through the day (well, I know some here who need double of that)
But I don't know if you heard about new batteries being developed that will charge in just 5 seconds and which have a much better molecular density to let the current flow faster? These will be available next year I believe...
If they can get the manufacturing process right hehe! Something about how the electrons fall into little neat holes instead of hopping all over or something and they needed to get the holes right somehow!
--EDIT-- Military next year not consumer I would think is likely!