the amperage is what ultimatley matters regarding battery life. using ohms law (
Ohm's Law Calculator ), you can determine the amps your pulling off the battery.
for example, if your running a 2 ohm carto at 4v, your wattage is 8 and your amps are at 2.
if youre running a 2.6 ohm carto at 4.56, you are still gettting that same 8 watts of power, but your amperage is only at 1.75.
the 2 ohm carto will drain your battery faster than the 2.6ohm carto even though you are gettign the same vape from each.
another battery capacity issue to consider is the lifetime chargability of the batt. if you continuously run the battery to death each time before charging, it will significantly lower the lifetime of the batt. charging at 50% is the optimal choice for prolonging lifetime of the batt. of course this may not be practical, but any amount of life remaining in the batt when charging will be better than none.
do not be shy of giving your batts "shallow charges". gone are the days of having to run your battery dead before charging. this was the rule of thumb among nickel based batts of the past to avoid damaging the battery capacity. most folks still use this rule, but not only is it not appropriate for lithium based batts, it damages them.
lithium based batts should be charged at 50% optimally & they like shallow charges (for example, charging the batt when its at 40% up to say 80% is fine. or even from 80% to 100%). using the batt while its charging is not recommended even though most "passthru" batts encourage this. the reason is because you are forcing the battery to give and receive power at the same time which puts undue stress on the chemistry.
not only does this info pertain to our vaporizers, but also to your cell phones, laptops, electric toothbrushes, razors, etc.