I know with joyetech 510 batteries there is no lack of performance due to a low battery -they just vape away as strong as ever until boom -it's dead. I will admit that when I first began PV's that I wanted it to look like a cig -then one day I came to the realization that it is not a cig, and therefore does not need to look like one...I ordered an eGo, which is fabulous as far as battery life, but then I quickly realized that I liked the comfort of holding the 510 size like I held a cig, and being girly, I wanted something long and elegant, as well as having good performance, so then I ordered the 510 mega and am perfectly happy with my set-up. I still use my eGo at home a lot with a drip tip cause I like to drip a lot...even then in between I like to hold and use my elegent mega 510. As long as you have at least a few 510 size batts around and one always carying a full charge, not a problem. Add a PCC to that, and it's even less of a problem. It's just as easy for me to carry around two fully charged mega 510's as it is one chunky large battery. Everyone's preferences are different. You just have to find your personal comfort zone.
