I'm not sure exactly what you're asking, but wattage is a function of voltage and resistance. If you know the voltage of your battery and the resistance of your atomizer, you can find the wattage with
this chart or with the following formula:
W=V2/R
Wattage = Voltage times 2 divided by Resistance
J.R.
ETA : I don’t know what the amp limit is on Volt
batteries, but you can find the actual amperage with the following formula:
A=V/R
Amperage = Volts divided by Resistance
Imagine might know the amp limits for Volt batteries.