My P8Pro upgraded to 1 yesterday. Battery life already noticeably worse. And 15 really brings me personally not much I'm interested in. Meh.
How many charge cycles have you gone through since the update? Battery life often seems worse for the first day or so after an update because updates use a fair amount of energy. I would give it several more days and see if it still seems worse after that.My P8Pro upgraded to 1 yesterday. Battery life already noticeably worse. And 15 really brings me personally not much I'm interested in. Meh.