mods in fact do draw more than 3 amps from the battery because the circuitry isn't ideal, there are some power losses internally. Using an efest with 10A drain makes a notably improved vape compared to my 5,6A sanyo batteries. (that is in a vamo and zmax)
I wouldn't recommend stacked 2x 18350s because they're a lot more likely to cause issues if you don't charge them as a pair in an accurate manner.
See advice in this thread on this topic: http://www.e-cigarette-forum.com/fo...463360-stacking-2-18350-battery-question.html
On several flashlight forums and here on ECF I've read warnings and advice to avoid all products with "-fire" in the brand name.
I wouldn't recommend stacked 2x 18350s because they're a lot more likely to cause issues if you don't charge them as a pair in an accurate manner.
See advice in this thread on this topic: http://www.e-cigarette-forum.com/fo...463360-stacking-2-18350-battery-question.html
On several flashlight forums and here on ECF I've read warnings and advice to avoid all products with "-fire" in the brand name.