Right now I have 2 Prodigy V3.1 @ 6volts, I am tired of being limited to the atty's and carto's that I can use on it.. I really like the higher voltage vaping but I would like to be able to change it up, this is why I am leaning towards VV PV.. I really like the Pro-Vari in chrome and would also get the battery extender and the 18650 batteries.. My question is for everyone how long does a full charged 18650 last, hours, days?? And any other advice you could give about the PV would be great.. Thanks in advance..