As with the recent developments in vaping, you should pay special attention to this safety information. Actually it is difficult to say exactly what the safe discharge rates are for these batteries. Currently the known safe constant discharge currents for AW and Efest batteries stand at 5.5a for 18350 size and 10a for 18650 size. This makes the lowest safe coil resistances 0.76 ohms for 18350 and 0.42 ohms for 18650. Do not go below these levels unless you have specific batteries and have seen the manufacturers' specs regarding safe constant discharge current. Joyetech eVic VT is a VV box mod with temp control function, much safer than a mechanical mod and carefully read the specs before vaping it to ensure the safe using. Believe this stuff is a safe choice due to its adopted unique temp control system(Ti and Ni)!