I just got my smoketch redux in the mail, filled it up hit the fire button and nothing happened. Can someone help me I don't know what I'm doing wrong. I'm using a knock off ego 1200 vv battery set at 3.7 and also tried 5.2 if that helps. Do I need a separate atomizer to use these? I thought it was built in. I have 2.5 ohm replacement heads should I be using those instead of the 1.8 ohm head that came with it?