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I have problem with my Xperia ZR
when I tap Stamina Mode in powermanagement, it will not changethe estimated standby time, so I went to Apps ->All ->Eco mode controller->clear data->force stop-> and restarted the phone, it works and after couple of days the same problem & every time I have to do the same step & restart the p
This will change depending on usage. Check the same after using it for a week and see.
http://talk.sonymobile.com/t5/FAQ/Battery-time-and-enhancement-features/m-p/347874#U347874
The STAMINA mode will constantly re-evaluate your usage and update the expected standby time accordingly.
This standby time will completely vary depending on your own personal usage. You may see that when you first start using your handset, the Standby time will be higher than what is expected after you have used the handset for a few days. This is due to STAMINA mode having no previous usage history to estimate from.