All the devices of the Xperia Z Series contains a battery management tool called Stamina Mode. With this Stamina Mode our Xperia device can increase the stand-by time by 400%. This looks like witchcraft. But its genuine from Sony. Its a pretty simple technology. By cutting back on the background activities of the phone, the battery gets to have a little rest. Then it can improve the stand-by time.
Withe the Stamina mode after the screen is off all the app will not sync, check for notifications or incoming message. These activities will eat your device's battery even your phone is on your pocket. Additionally Stamina Mode will block all the data traffic that sent over Mobile Data and WiFi when the screen is locked.
According to a tweet from tipster @Ricciolo1, After the Marshmallow update of the Xperia Z5 Compact, Xperia Z5 and Xperia Z5 Premium, the stamina Mode of these will be improved making their batteries "Real Champions". Sony says that with 2900mAh on Xperia Z5, 2700mAh on Xperia Z5 Compact, 3430mAh on Xperia Premium will have at least 2 days of battery. According to @Ricciolo1 after the marshmallow update definitely the 2 days battery of Xperia Z5 line will be changed.
#XperiaZ5 #XperiaZ5Compact #xperiaZ5premium Battery,to become REAL CHAMPIONS ,thanks to an "IMPROVED" STAMINA MODE in #Marshmallow #soon ;)— Ricciolo (@Ricciolo1) October 31, 2015