I've just received my first PV yesterday, and I'm having some serious trouble with it. For the first few puffs, everything worked fine -- so far so good. Quite quickly however, I noticed that I was getting virtually no vapor out of it. Thinking it was just a dead battery, I recharged it overnight, without any success -- this morning it was still only good for a few puffs. I tried switching the cartridges, to one that I could see the liquid in (the filler was saturated), and still nothing. I tested the battery with a meter, and it's putting out 3.5v, which should be well within the tolerances for the 510 atty I have hooked up to it. After I took the meter off of it, however, it's having more/stranger trouble -- now, with no atty hooked up, the LED stays on (and the circuit is closed, I've verified that with the meter) -- but if I push the button the LED turns off and no power is released; essentially the function of the switch is inverted. When I screw an atomizer onto it, the LED stays off and neither switch position is turning the power on. Has anyone ever experienced anything like this before?