actually battery life of two 16340s isnt too bad, but 2 18350s would be much better. an 18650 version would literally be like carrying around a brick size wise. Depending on your vaping style, you should be able to get at least 4-6 hours I would imagine.
Volume-wise an 18650 is only about 20% larger than two 16340s. If you laid the billet out different (18650 vertical with the dial under the tank) it would not add much size at all. Problem is you need a different chip (boost) to run a VV off of just one battery so its more than just shuffling the pieces around.
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