Ok I just bought an Xperia Z1. Everything seems to work fine except I can not get the Stamina mode to increase to 6 days and more. I've seen people online (forums/reviews)getting it up to 15 - 20 days!
I basically I turned off everything. Stamina mode @ 100% charge is 5 days & 11 hours. If I turn the Stamina mode off.. Just 2 days and several hours.
Did I get a faulty battery? Any other settings I should know of? I haven't downloaded anything yet from the PlayStore.
Model : C6903
Android Ver: 4.3
Firmware : 14.2.A.0.290