I've had my Provari for about a year now and I am still using the same 4 batteries (rotated) that I received from Provape with my order. 2 x AW IMR 18490's and 2 x AW IMR 18650's.
I seem to recall at first when I would check the voltage, even with an atty attached, it would read 4.2 fresh off the charger and that is normal. However, a year later now, when I check the voltage with NO atty attached it reads 4.2 as it should...yet when I attach any atty and check the voltage it then reads 3.8.
The batteries clearly don't last as long as they used to either. I used to get 2 days with the 18650's and now I'm lucky to get through a day. Likewise the 18490's used to get me through a day, but now barely half a day!
I can't be certain if my vaping habits have increased (I'm sure they haven't THAT dramatically) or if it's just time for new batteries, or a combination of both probably?