Wattage/amperage is determined by the net resistance and the relative constant of a charged battery voltage... easily calculated with Ohm's law.
For example, with a fully charged 18650 battery at 4.2 volts, a net resistance of 0.5Ω will produce a discharge of 35 watts and 8 amps... rounded off.
As both values are well below that of a typical 18650 battery... you have plenty of "headroom".
The above however does not tell you if your build and available wattage is optimized for best performance. For that, you need a coil modeling program, like Steam Engine.