What happens if you use Nickel or Titanium coils in watts mode?
Nickel coils usually have a very low resistance. They have to, because they need a lot of breathing room above their intitial cold resistance, since nickel's resistance rises - a lot- along with its temperature. If you ever wondered why your regulated mods accepts lower coil resistances in temperature mode than in wattage mode, that's why.
Let's assume you have a Ni200 coil, sitting at 0.1ohms on the top of your mech mod
0.1ohm means the quotient of voltage to current is 1 to 10. Since the mech mod can't regulate voltage, it will usually fire with somewhere between 3.2-4.2volts, depending on its charge. As a result, the drawn amps would be betweeen 32A and 42A. Not good for a single battery mod. In a parallel-wired multi-battey mod this can be ok, because the voltage stays the same, while the amperage is evenly split between the cells, taking the load for a single battery back into safe territory. In a series-wired multi-battery mech mod however, the voltage doubles to 6.4-8.4, which means it will now try to draw between 64 and 84amps. Not going to happen.
In a regulated mod, things are different. In TC mode, the coil`s resistance is watched continuously and the output voltage (resulting in amps drawn and therefor wattage delivered) is regulated accordingly at all times in order to keep the resistance below a certain threshold (translating to temperature). In VW mode, that last bit doesn't happen. If you only use suited materials in VW mode, the coil material's resistance is not going to change significantly when it heats up. But it does for nickel, and when the coil's resistance rises, the mod has to raise the output voltage to compensate for the drop in amperage. If the required voltage exceeds that which the battery (and the voltage-booster on the PCB) can deliver, who knows what will happen. Maybe the mod's software will tell it to stop firing, or keep firing at its maximum voltage output, or maybe the voltage-booster goes up in smoke if it isn't properly protected. Someone should try that. Not me, tho.
And the other things is: Despite your personal choices, the TC mode has fixed maximum temperature values for its coils. VW mode doesn't care. If you keep on firing in VW, the coil will easily exceed those temperature limits. Will the nickel then start to release unhealthy particles into the air you suck up? I don't know. What I know is, Nickel is bad for your body. And people can be allergic to it. Better not take the risk.
