Ohms law is what it all adds up to. If you do not change your coil, and all other variables are constant the battery life will not change. The difference between the two devices (the one you have and the one your looking at) is one is regulated and one is not. The mechanical gives the coil its full power that it has available as it discharges...you should notice that as the battery dies, you vapor production will be less if the draw time and intensity is not changed.
The cana can heat up a higher ohm coil better than a mechanical because it will increase the voltage to the coil, heating it up just as well. With the coil your running, i would imagine that 30 watts would actually result in a decrease in performance....I did not do the math, but if you figure 3.8ish volts at that ohm, the wattage drawn by the mech is probably more....dont have calculator right now. Where as if you put a 1.0 or 1.5ish ohm coil on there, 30 watts will heat it quickly. Good vapor production and possibly longer lasting...again refer to ohms law and if you did the calculations you could find how much is being drawn versus what the mechanical is drawing.
So without changing the coil, I do not think you will get what you are trying to do achieved. It will fall short either on vapor production/performance most likely. If however you build a higher ohm coil, you can probably get it to your liking.
Ok, i think that what i remember and posted there is correct....please do some calculations and you will see.