I got this GP 510 passthru couple of weeks ago and can not seem to get any vapor out. When I first got it I tried it out and thought it needed to charge, maybe it has a battery. I let it stay plugged in the usb port a while and tried again. I got a few sporatic puffs then nothing. Needs more charging I guess. I decided to give it another try so I plugged it in again this A.M. and left it. I tried using it again just now and nothing. My VK passthru works fine on both usb ports I am using, this one works on neither. I tried it on a different computer and still nothing. Is there something else I am supposed to be doing? Is there a battery that is not charging properly?

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