4.4v @ 2.5ohm 7~watts. 2
coils 3.5~watts a piece
Sorry I'm getting side tracked here. I'm not exactly sure how dual
coils work but I'm pretty confident that you wont be getting twice as much power as a single coil. I'm going to look it up though.
Results=
Undestanding resistances, LR and HV
DC Cartomizers
Dual coil cartomizers seem to be all the rage lately but there is some confusion on how they actually work.
A dual coil carto consists of two coils of the same resistance. They are wired in parallel so the total resistance is half the resistance of either coil.
For example:
The total resistance of the 1.5ohm dual coil is 1.5ohms, but the resistance of either coil it contains is 3ohms. Both coils are actually 3.0ohms individually, together they are not 6.0, they are 1.5ohms
A 1.5ohm carto at 3.7V would be drawing 3.7/1.5=2.47 amps. But the single coil is burning at 3.7^2 / 1.5 = 9.13 Watts, while each coil of a dual coil 1.5ohm carto is burning at (3.7^2/1.5) / 2 = 4.57 watts. You are spliting the power between the two coils.
Although you can certainly get away with it, a 3.7v device is not ideal for a DC cartoi, you should use a 4.5v or better.