He was useing a portable power pack for USB pass thru.. The ones i have seen don't last long like the one this dude had.. He was going on 23 hours with 1 charge. And it had a nice belt case for it...
USBs run at 5 volts, not 9 volts. Don't put 9 volts on an atty, it is too much and will burn it out. I have seen battery mods running as high as 6 volts using two 3 volt CR2 lithium Ion batteries in series and not damaging the atty. But that is as high as would dare to go.
__________________ Cigarette free since May 4, 2009, and hoping to vape longer than I smoked
Note: This message was created entirely of recycled electrons, manufactured before 1899 in an effort to prevent global de-electrification.