Stamina mode is back with Marshmallow update rolling out for Japanese Xperia Z5's

Sony's iconic Stamina battery saving mode marks a return in the latest Marshmallow update rolled out by Japanese carrier NTT docomo. The new firmware is arriving as we speak on current flagship models Xperia Z5, Z5 Compact, and Z5 Premium, as well as on the Xperia Z4 (a Japanese-exclusive name of the global Xperia Z3+).Earlier Sony Marshmallow builds had the feature removed, instead letting