No Stamina Mode, only Extended battery mode in Xperia S LT26i ,SL, Acro S LT26w 6.2.B.1.96 firmware Published August 24, 2013 at 360 × 640 in Xperia S,SL,Acro S 6.2.B.1.96 firmware Rolled – Major Update fixed 1080p HD Video Lag, Volume Up button bug.