just wondering... when I first started using my v2 with the 18650's I was a little disappointed that they wouldn't last me through a work day. also, when I got the blinking light on the button, the battery seemed to go dead pretty darned fast after the first flashes. been using this gear for a few weeks and it seems like nowadays, same unit, same batteries, I'm not getting just a full day, but about a day and a quarter which is how much I thought I'd get in the first place reading other posts. lots of time after first blinking before it goes dead now too. no changes to voltage or frequency of use. I probably use it slightly more now since I cut my nic level down with my last batch of juice. don't think it was a charging issue either, I sprung for one of the fancy shmancy pila chargers. is this battery behavior normal from the ones from the provape site?