Hi!
Your battery is 3.7v. Your coils are dual making a total of 1.5ohms.
Before you get too annoyed with what you have, try a single coil 1.8ohm Kanger instead.
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To be honest, I was sent 3 of the then-new dual coil Kanger clearomisers to review (9 or 10 months ago??) and the performance was dreadful. So much so, I needed to put them on a huge 18650 mod and crank it up above 10w to get even half-decent vapour.
.. and yet, I can happily puff away on an evod battery with a 1.8ohm single coil....
