So accidently ordered this thinking it was one I could use my rechargable battery with. Turns out this one is a disposable one piece pen with no way to recharge. It basically says that in the description so I cant complain about that part. However upon using it, I found that it is very weak. Even after taking a rather large pull, I wouldnt get very much that would heat up to proper temp and I wouldnt get a proper puff The worst part Of it was the battery died halfway through. So now I have a half full vial that is wasted and no way to recharge. I suppose I could break open the pen to get at the rest of the juice but shouldnt have to. If you have any kind of tolerance then this pen is not for you. Weak product and sh¡tty battery.