I know it sounds weird and scientifically I guess it doesn't make much sense, seeing how the atomizer has to warm up to turn the ejuice into vapor in the first place...but the 510 I got today is my third ecig and the previous two, although far inferior, did give a warm vapor. My Joye 510 produces great vapor, throat hit, okay flavor (probably from the atomizer breaking in/primer etc.) but it is cool vapor, not warm. I can sometimes get it lukewarm, but that's about it. Out of curiosity I stuck on a cartomizer from a prior kit and got less vapor/TH but it was warm. I'm really confused...could the atomizer be bad, or breaking in, or is the battery not producing enough power to warm up the juice? I noticed the battery button barely clicks in and the light turns on and if I push really hard on it, the vapor will get lukewarm, but I feel like I am breaking the battery! BTW both batteries/atomizers give the same results. I have charged 8 hours etc. etc. and on a full freshly charged battery it is no warmer than an almost dead battery. Tried several juices and a prefilled cart and the only way I got even a little warmer was to use an old carto! Any ideas?