So a few days ago I get a couple of new attys and pulled one out and started using it as I killed my last one with a home brew mod I was trying out. I had almost forgotten how much I loved fresh 901's when I started puffing on this thing. The cloud of vapor was great, the throat hit was perfect, I was in heaven. Then yesterday when I get home from work I throw the atty on my passthrough and after a couple of pulls it seemed like my passthrough had died on me. After reading about others having their passthroughs die relatively quickly I chalk it up to that and throw the atty on one of my charged batteries and get one vape on that and it dies on me rather spectaularly I might add as smoke came puffing out of the led end. I thought that was odd and switched to another batt and then the same thing happens. Both batts were old so I thought it was odd but didnt really think it was the atty untill I tried the third batt and the same thing happened, one drag and plume of smoke from the LED. It would seem that the atty got messed up somehow and shorts out my batteries. I havent talked to my supplier yet as I wanna see him in person to explain it. My passthrough works with my other atty now and I am so glad I have that 510 as a back up. Just thought Id share my pain with you all.