So, if you are using a 3.7 volt battery, with a coil that has a 1.8ohm resistance: 3.7 / 1.8 = 2.05 amps, which should be okay with most batteries. However, consider what happens if you start using a rebuild-able atomizer, and you make a 0.5ohm coil: 3.7 / 0.05 = 7.4 amps, which is still okay with a 10 Amp battery.read more >>