Let’s build a dual microcoil on our IGO-W. This dual coil comes to 0.40ohm exactly. 6 wraps of 26 gauge kanthal. See below for ohm calculations and battery amp limits.
Calculate your current (input 4.2 for voltage and use ohm reading 0.40ohm)
Most common battery amp limits are listed here.
So, if your build is 0.40ohm like mine, you’ll need to use a battery with an amp limit above 10.