The 18650 would make it have to raise the voltage from 3.7 to where ever you vape at with a boost regulator. With the 2x 16340 batteries it has to lower the voltage from around 8 volts to where you vape at. So with the 2x 16340's you get more vaping time per charge unless you put 2x 18650 but that would make it pretty damn large.Well, I guess I'm a Buzzard now. Wonder if they'll ever make one that can fit an 18650 battery. It's long enough. Just saying.....
It's more efficient and doesn't stress the batteries as much, thank you for the great explanation 5C![]()