The Kanger SubTank uses a very low, sub-ohm resistance atomizer. Sub-ohm devices can be dangerous if you do not have the right equipment. Kanger SubTanks will only work on a mechanical mod with a battery capable of 30 watts or higher or an electronic mod capable of 15 watts or higher. If you have a 0.15? coil, your mod must be able to fire atomizers with 0.15? resistance or lower. Make sure that your mod and batteries can handle sub-ohm coils. If you’re using a regulated mod, verify if the device and the battery are suited for the right amount of amps. If you’re using a mechanical mod, please use 30 amp batteries or higher. To be sure, always use an ohms calculator and check your amps.