18650 with a Kick 2. I have it set for about 8 watts, and my coil is about 1.7 ohms.
I cannot measure the voltage drop with the kick 2 because it outputs a negative voltage, and my inline meter registers only posative voltage. The voltage drop without the kick with a 1.5 to 2 ohm coil seems to be about 0.1v.
I dont think voltage drop matters with the kick 2 because I think it compensates for that, and as the battery gets low, the kick adjusts the output to give you the same
vape up until you have to change the battery.