Warning: This tank uses a sub-ohm resistance atomizer (0.25-0.5)  You must be sure that your mod and batteries can handle SUB OHM coils. If you're using a regulated device make sure it can handle the Amps. For mechanical mod users, please use 10 Amp batteries or higher for .5 ohm coil heads and 20Amp batteries for .25 ohm coils. On mechanical mods .25 ohms will require 16.8 Amps @ 4.2v (70 watts) .5 ohms will require 8.4Amps @ 4.2v ( 35Watts), these calculations do NOT account for voltage drop/loss