I agree with bebop,save your dough,time for a new mod,if you already have the ni200 coils on hand,you can use that same tank on an istick 40 watt tc,they are inexpensive, have a higher battery capacity, and still the internal battery you are used to.they only support nickel in tc mode,but if that's what you are already using, I don't see a problem.I think you would be pleasantly surprised by this mod,it is very simple to use!