Though you can use the ST on a mech, it's far better suited to a regulated mod. In my experience they take some fine tuning in terms of wattage and juice viscosity, a regulated mod allows to find the sweet spot. A mech on the other hand will just feed it as much power as it will take, subsequently you may get a lot of burnt hits.
Assuming the mech has a fully charged battery, a 0.5 ohm coil will be pulling north of 35 watts. I have had my RTA work at that wattage on occasion, but not a stock OCC coil.
Assuming the mech has a fully charged battery, a 0.5 ohm coil will be pulling north of 35 watts. I have had my RTA work at that wattage on occasion, but not a stock OCC coil.