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 Android do the dozing on its own. Putting inactive apps to sleep is only part of what Stamina does, though - turning off functions like Wi-Fi and mobile data to save power is also among its...
Source: http://www.gsmarena.com/stamina_mode_is_back_with_marshmallow_update_rolling_out_for_japanese_xperia_z5s-news-17851.php
