I got mine fully charged and it lasted a good long time.
Not sure which batt it came with actually, but I did put it on a USB cable to my computer and a few hours brought the batt readout up to what looked like full, but its gone down faster than the first couple of days.
I guess i should have it set up for overnight on a wall -> USB for complete recharge?
edit: as I was writing this post (while taking first vape of the day on my XPV40) the batt readout went up from where it started ! lol so maybe not...
The lite read out next to the USB slot turns green when complete charge.I do not understand why Protovapor stopped using the Sony VTC5's because mine lasts all day long into the next day.I do not notice a quick drop off in battery level just an even drop thru out the day.