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i don't know why you got rid of it, my z5 premium just dies over night when i leave it with 20% charge, like 6+ hours ago i left my z3 on 4% charge expecting it to be dead now being certain that it's dead, it's at 1% now and i checked like 20-30 min ago and it's not dead yet, it has been sitting on 1% battery for like 30 min now, no new sony phone has that good of a battery life in standby and i don't know why, why did you kill off this? my z2 tablet manages to stay turned on for weeks on end to the point where i just forget it and then find it again to use it, none of my new sony devices do this and i bet it's the same with the xz premium, my z3 also manages to charge up to like 40% in like 15 min, no new sony device does any of this, my z5 premium is the complete opposite i hate that phone because of it's horrible battery life, i just leave it and expect it to be dead the next morning, not to mention how painfully slow it is to charge, i actually bought a z2 some time ago and that one ran for over a month on standby.
so why did this change?
oh and at the time of finishing this text my z3 is still running on the 1% so right now it has been running for over 30 min on 1% (10 more min and i heard it vibrate from a notification it just got IT IS STILL running)
So you had a phone w/o turning on the screen for a month, anyway, back to the topic
do the following
charge the phone 100% go to settings > battery > tap on the battery icon > take a screenshot
first thing in the morning settings > battery > tap on the battery icon > take screenshots of the graph and list of apps
post them here
exactly, my z2 was off for around a month i just turned it on a few seconds every few days to check the battery level, my point is that no new sony phone can do this they simply die overnight even with the screen off, and i will get my z2 and do that then it's laying in a box right now i never use it.
Do post the screenshots that I've requested, from your new Xperia and your old Z2, it should show that it has been on the same charge for a month.