https://community.sony.ie/t5/m-series/stamina-mode-deteriorating/m-p/3471430#M14509 You sir were Right. I changed my patterns and got it to increase up to 3 days on Stamina Mode Fri, 01 Jan 2016 04:58:18 GMT Sethoxicated 2016-01-01T04:58:18Z https://community.sony.ie/t5/m-series/stamina-mode-deteriorating/m-p/3471428#M14507 With each and every charge the battery usage left depletes. When I first used it, it says 6 days left on stamina mode but right now even on Stamina mode it only has 19 hours of battery life.<BR /><BR />This Sony Xperia m4 aqua is only 3 weeks old. Pls reply ASAP. Sat, 26 Dec 2015 22:06:07 GMT https://community.sony.ie/t5/m-series/stamina-mode-deteriorating/m-p/3471428#M14507 Sethoxicated 2015-12-26T22:06:07Z https://community.sony.ie/t5/m-series/stamina-mode-deteriorating/m-p/3471429#M14508 <P>Stamina mode will estimate the battery life on your recent usage pattern. So it means the battery will last for 19 hours on your normal usage. If you change the pattern, the estimation might increase or decrease.</P> Sat, 26 Dec 2015 22:07:55 GMT https://community.sony.ie/t5/m-series/stamina-mode-deteriorating/m-p/3471429#M14508 _alexdon_ 2015-12-26T22:07:55Z https://community.sony.ie/t5/m-series/stamina-mode-deteriorating/m-p/3471430#M14509 You sir were Right. I changed my patterns and got it to increase up to 3 days on Stamina Mode Fri, 01 Jan 2016 04:58:18 GMT https://community.sony.ie/t5/m-series/stamina-mode-deteriorating/m-p/3471430#M14509 Sethoxicated 2016-01-01T04:58:18Z https://community.sony.ie/t5/m-series/stamina-mode-deteriorating/m-p/3471431#M14510 <P>Awesome.</P> Fri, 01 Jan 2016 09:28:59 GMT https://community.sony.ie/t5/m-series/stamina-mode-deteriorating/m-p/3471431#M14510 _alexdon_ 2016-01-01T09:28:59Z