I use the Vmod from Vapage.com. It takes double stacked - IFR14250, 200mAh, 3.2volt bats for 6 volt vaping, but battery life is really low. I notice that you carry 14250 300mAh bats. What voltage are they? Also, will any of the other 1/2AA size bats fit with higher mAh's than the 300? Thanks a lot.