Although no margin of safety remains... Ohm's Law indicates you can optimize 0.6Ω with 7 amps. The new "purple" Efest 18350 battery is rated at 10.5 amps.... so, 0.4Ω.
I sub-ohm all the time with my Purple Efest 18350's.....I usually try to keep it up around .6 to .8 Ohms though, just to have a bit of a safety margin.....But they work great!!
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