I have a Sony Xperia Z1 as well and the battery lasts over 3 days. Make sure to enable the stamina mode http://developer.sonymobile.com/2013/11/26/power-managem

I have a Sony Xperia Z1 as well and the battery lasts over 3 days. Make sure to enable the stamina mode http://developer.sonymobile.com/2013/11/26/power-management-explained-sony-xperia-z1-and-xperia-z-ultra/ http://developer.sonymobile.com/2013/11/26/power-management-... it actually works pretty well.