Im pretty new to vaping. After trying basic clearos and batteries a few months ago I stepped up and went for the EMOW kit. Not knowing alot a bought it though it came with 1.5 ohms coils and a VV of 3.7,4.0, and 4.8. After having trouble with the VV and coils. I sent it back and the company said it was fine. I then did some research (that I should have done before) and now know that 4 and 4.8 is useless on 1.5 ohms. At least it was for me. I now use 1.8 ohm coils and it works on the 3.7v. The battery does work well on 2.2 ohms on 4v so I am happy about that. I just wonder why kanger would sell something like this. They are also going with a new dual coil that only goes up to 1.8 ohms. I'm making the best of this device, just venting and hoping someone will explane the ohms/volts/watts thing a bit better. Also who has had the best luck with long lasting coils? Thanks