Provape recommends the AW line because of their "consistency". How do I know this, anecdotal information. I had a V2.5 that wouldn't power up with some of my IMR 18650 button top cells, ( EH branded). I sent the unit to Provape with one of the cells, and they modified the board by sanding it to allow connectivity. A notation on my work order stated that the reason AW cell are recommended is for many reasons, one of them being button height consistency. A battery is just a pool of energy with a capacity to deliver it at a certain rate and volume, nothing more, nothing less. One of the only reasons I am interested in the P3 is it's GREATLY increased ability to use available cells. Availability being a major concern. ( I am talking down the road a ways here). The ability to power up with flat tops is a huge plus, no matter who made them, as long as the specs are up to the task...