I usually build RTAs @ 0.2 ohm so did some homework and decided to get these for my Aspire Feedlink. Ended up with a 0.45 ohm coil in a NarCa rda as my sweet spot. I go thru 2 batteries per 'tank' (7ml). I also have tried LG HG2 and Samsung 30Q but find these Samsung 20S perform better in this type of setup.
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