Hmm, not that easy. A standard 900 mAh battery will be able to put out a burst of nearly 2 amps at 3.7 volts. if you crack the volts up, amps will drop down somewhat, but the result would be a higher energy deliverd by the coil.
If really voltage is higher, you will get a hotter coil, resulting probably in shorter pulls, so the time you get out of the battery could be even longer, depending on how you vape exactly.
If really voltage is higher, you will get a hotter coil, resulting probably in shorter pulls, so the time you get out of the battery could be even longer, depending on how you vape exactly.