Have been a long time browser of these forums, started with the starter pack on smokeless image with the disposable cartridges and short battery upgraded to an x2 passthrough a little while ago I love it went from nano clearomizers to T3 single coil to T3 double coil. Just upgraded the battery too to the biggest size. The new battery I got doesn't seem to work, I called SI and they're sending me a replacement as it might be a dud, I have it on charge now as it might have just been dead. I've been using the new dual coil cartomizer on my old battery and it works very well, but it seems to be a pain in the ... to get it all in the right spot to work right. I know the cartomizer shouldn't be screwed too tight onto the battery, just enough for contact. But when refilling the cartomizer and screwing the coil back on how tight should it be for optimal performance? Tightened all the way or just enough for contact again? I think this may be part of the problem with how I don't always get good hits the light doesn't turn on sometimes when I drag I think the coil is having trouble connecting to the battery. Just wondering if anyone has had any similar experiences or has any advice. I love vaping I prefer it to cigarettes now and am always vaping all day wherever I go. Would love to get my setup perfect.