Its been a 1 year 6 months with my Z2 and the battery life seems much less now. In fact now I get the same use time from both the M8 and the Z2 "Both have been bought about the same time" of a day.
Has the 3200mAh battery deteriorated ?
I am running full stock waiting for 6.0 but this reduction is really unwelcome.
EDIT: Charge it with the magnetic charging stand only dont use microusb at all.