I don't know anyone that vapes at 15 watts,
6.0v through a full standard dual coil (1.6 ohms w/ out juice and 1.7 ohms full of juice) = 19.8 watts. lots of people do it including occasionally me. I'm usually closer to 14 watts and sometimes around 16.5, but I have a couple of juices I like in the 20 range.
But indeed. 2.5 amps would be a real trick to make 15 watts with any existing cartos or attys.
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