I'm sure this has been covered?

[cadillac6661]

I'm a bit advanced but, not as much I'd have thought early today... I've been running roughly .5-.9ohm coils on various RBAs (AGA T+, Pulse G clone and now, an iGo w4 rda). 18350 efest batts 28 awg Kanthal with no problems. Stopped into the local B&M and they looked at me crazy when I mentioned this! I looked online and saw that this seems to be dangerous. I've had zero problems. My concern is I'm trying to get my wife into more advanced set ups. However, I refuse to do anything that is dangerous for her. I do want her to have a primo vape though.



What gives????

 

[TomCatt]

I'm assuming you are using a mechanical mod with IMR batteries only. The main concern with using "sub-ohm" coils is the strain it puts on your battery.

With a 0.5 ohm coil and a freshly charged battery (4.2V), you'll be trying to pull 8.4 amps of current out of the 18350 efest. From what I've been able to find, these batteries are rated at ~8C - this means 8 x 800mAh = 6400mA = 6.4 amps. 8.4 amps is way over the safe amp-draw rate for this battery.
While IMR batteries are safer than ICR ("protected") batteries; they can still vent hot gasses if they fail.

For any sub-ohm coils lower than ~0.7 or 0.8 ohms, it is probably a much better idea to use 18650 IMR batteries instead of 18350.

Always check a battery's specifications for Maximum Discharge Current and use an Ohm's Law calculator (Ohm's Law Calculator) to check that, with your coil resistance, your system isn't going to try pulling more current from your battery than it can safely deliver.

 

[Ryedan]

Yup, TomCatt nailed it

Only thing I wanted to add is a link to a battery selection chart. It's got each battery's amp limit and minimum safe coil resistance listed.

Vape safe!