I used the iphone as my primary device receiving hundred of email s and push notification conducting 2.5 hours of browsing three hours of music play back pictures and playing the odd games of angry birds 20lonthe train homeat the weekend it spent most of the day sitting on a table untouched but I still went to bed with only 30/. Charge left Apple, s new low power mode little appreciable difference in Real world use Apple has chosen weight and thickness over battery life which is a poor choice your experience may very but I suspect you will have to charge the iphone 6S twice a Day