If you are running a dual coil at 10 watts, its going to run down faster than a single coil at 5 watts.
The MVP is a pass
through, so you can plug in to charge while you
vape; it will last longer if you don't let it go down; these lithium
batteries are different from the earlier rechareables where it used to be better to discharge the battery.
Also, with a regulated box like the MVP,
the electronics cuts off once the battery goes below a certain voltage (probably 3.7v i think); most people say their mvp runs for a day or 2 before needing charge.