Right I've got two eleaf istick 20 watt battery's one is my girlfriends and one is mine I purchased two aerotank mini's and mine works perfectly but my girlfriends seems to flicker around on the screen where you read the ohms mine stats that it's a 1.6ohm coil but yet hers will flicker around from 1.7 way up too 3.00 then go too 0.00ohms and not work at all I've tried many new coils and stuff messed with the center pin and even my aerotank works with her battery any comments helping me thing would be great because I'm quite confused at this