so i got some 2.2 ohm coils. like them better than whatever comes in the starter pack so i switch one out and my battery blinks 3 times...no result. worked fine on another tank. put the original coil back and it worked fine. put another new coil in and no problem. im assuming this is just a bad coil? how often do you get a bad one? or did i do something wrong? battery charge ok, wick was not in threading, all clean and water free.