I just purchased the vaporesso PT60. I use smart wattage, but it doesn't change the voltage. Voltage is set at 1 not matter if I turn the wattage to max. I can adjust it with it's variable voltage setting. but don't know what to put it at. I've tried all these calculators but I don't know the battery amps out put. Cant. find it anywhere. I turned it up to 2 and I think it's better, hard to tell. Using a .6ohm coil at 25 watts. I'm not sure what to set it at, do people even mess with voltage and only change watts? Confused because I had seen many reviews that that state most devices run around 3.7v. There's a sheet that says 3.7v is in the safe zone but that seems too hot. Any help would be great .