If your using that coil, make sure you dont chain vape. And if your batteries start to get hot, remove them quickly and change the coil. Safety first. A .15 ohm coil will pull quite alot of amps from your batteries. Use an ohms law calculator if your really concerned about safety. All you need to put in is the coil resistance and the voltage being applied.
Not quite. Wattage and the voltage your mod kicks the batteries out as discharged x number of batteries (series mod) will give you maximum amperage. (Wattage and the full charge battery volts gives minimum amps). The resistance is meaningless because the board varies voltage on the downstream side to make the required wattage whatever the coil may be; but the batteries never "see" this. They only see the board itself. Technically, for better accuracy, you should take the nominal figure of W/V and add something to represent the losses (I^2R losses) on the board itself, typically 5% or so. Our friend @Mooch has the technical skinny here: Calculating battery current draw for a regulated mod | E-Cigarette Forum
The Pegasus Mini is a 50 watt maximum mod. That's what I based my calculations on.
Resistance is irrelevant when using a regulated mod (as long as your mod can fire it). To calculate amp drain (at min battery voltage) all you need to know is how high a wattage you plan on using and then follow this guide by @Mooch to determine the CDR your cells need to be capable of supplying.
