dont know what happened to my other post so im posting it again.....lol.....anyways i have 2 ego t setups (650's) one black and one silver.......bought the dual coil carto and noticed that the carto only works somewhat (not a lot of smoke) on my silver ego t batt.....when i screw it onto the black ego t batterie......dead...nothing...no smoke no sizzle....they are both genuine ego t's....i used 2 diff carto's, filled them up till they leaked, put them down to soak for a while and then tried it, like i said it works on the silver but not on the black batts.....any suggestion??