I believe the power is getting stepped down to 6v going into the e-cig. Any light to be shed here?In short, it doesn't really matter so long as your battery is rated for the Amps your tank will be drawing.
Generally, the lower the resistance (ohms), the more your device will chuck out huge great clouds of vape... but it will also require higher power input, which means more batteries. This is more of a concern with Sub-Ohm vaping (ie less than 1.0Ω), where you will be putting 75w through a 0.2Ω coil, but still worth bearing in mind.
At 6volts, ie 24w, these coils will be commanding:
1.5Ω - 4A
1.8Ω - 3.3A
2.2Ω - 2.72A
2.5Ω - 2.4A
So assuming that 6v is correct, as long as your battery is rated for more than 4A continuous discharge, you'll be fine.
Personally I'd suggest going as close to 1Ω coils as possible, so the 1.5Ω coils will be pretty reasonable. How much 'smoke' do you want to vent, anyways?
Out of curiosity, which model is your replacement and why can't you get the coil out?
I got the KANGER CE4 LONG WICK CLEAROMIZER as a replacement, but the one installed in my pack is the Kangertech eGo/T2, which has the ability for coil changes.
Very unusual these days, as most people prefer replacable pods. Looks like a bit of bad luck in the selection department.
Personally I'd have suggested an Innokin Zenith tank.
I too am having to create a replacement for a potential Fincher because they have all but gone radio silent.
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