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Rich, you are correct... I was talking about the LG HG2, and my brain was focused on the Samsung 30Q, which are also 3000mAh batteries, but only rated for 15A continuous discharge. The LG are rated for 20A continuous (and tested to prove it). I've used both the Samsung, and LG batteries (25R, 30Q, HE2, and HG2), and I love the Samsung 25R (blue and green versions)... they retain near full capacity even after 1000 recharge cycles. I'm not a huge fan of the 30Q, anymore, because they don't hold but 50-60% capacity after about 350 cycles, but they are great for that first year. The LG is the opposite... the HE2 tend to lose about 20-30% capacity ability after ~400 cycles, but so far, the HG2 are still hitting near 3000mAh even after 400+ cycles. I'm about to purchase a new block of batteries to replace our aging stock of 30+ 18650's. My wife currently goes through two (sometimes three) batteries a day, and I go through three singles (or two to three pairs in the dual-battery-mods). So, I'll be picking up six fresh Samsung 25R-5 (green) for our single-battery mods, and probably four pairs of LG HG2 for the dual-battery mods. The old ones will be headed to recycling! Low Ohm is subjective, but most of us would agree that 0.15 Ohms is "low". Personally, I define "low" as anything below 0.5 Ohms. Sub-ohm is anything less than 1.0 Ohm.

Forget the wattage. it's not important. whatever coil you put in, set the voltage at about 3.7 V. then vape it and adjust up from there. somewhere in there you will find a sweet spot. Make a note of the wattage (watts are a product of voltage accross the resistance (ohm)) whenever you use a different ohm coil, do the same thing. If your using the same coil, vape the wattage you found works. the higher the voltage (or wattage - same difference) the more you will shorten coil life. So if you want longer life, be conservative in your power settings. A brand new coil will take higher power for a while. But you are likely to burn it out faster. there is always a trade off. I usually vape any coil I make at 3.9 - 4.2 volts and let the wattage fall where it may. (I get long coil life - 2 to 4 weeks). You can't adjust voltage and wattage separately. they are tied together. When you "raise the wattage" you are really just increasing the voltage across the coil. Raise the voltage and the watts goes up. lower the voltage and the watts go down. Its fine to remember the wattage and use that number to set your mod as manufacturers seem to realize that people focus in the wattage. But it's really the voltage you are changing. It's like a car. The speedometer doesnt make the car go. You dont "raise the speedometer", (wattage), you give it more gas (voltage).

I don't build any coils below .5 ohms, most of my coils are .7 - .8, unless I use dual coils I never get below .5 Smok coils are usually dual coil or even more, I believe they make a 8 coil setup. A .15 setup with 8 coils would be 1.2 ohms per coil, takes a lot of power to fire 8 coils. As far as the LG HG2 batteries go they are all I use, so I had to mention that they are 20A.