> Also, the battery was increased beyond the power needed for the extra display.
Yes but that makes sense. Horizontal phone size 5S->6+ increased by ~69%, screen size increased by say 65%. Overall phone volume increased by ~58%. If battery was 50% of the 5S volume and volume of electronics hasn't changed in 6+, the battery volume has increased by 116%. Some of these assumptions are likely off and the volumes slightly inaccurate but the point should stand.
Yes but that makes sense. Horizontal phone size 5S->6+ increased by ~69%, screen size increased by say 65%. Overall phone volume increased by ~58%. If battery was 50% of the 5S volume and volume of electronics hasn't changed in 6+, the battery volume has increased by 116%. Some of these assumptions are likely off and the volumes slightly inaccurate but the point should stand.