The Galaxy S7 and Galaxy S7 edge are also expected to come with large batteries – 3,000 mAh on the regular S7 and 3,600 mAh on the 5.5-inch S7 edge, with the S7 quoted to be able to last more than 17 hours of video playback on maximum brightness. The battery won’t be removable, but with such endurance most consumers shouldn’t rue the fact that the battery will be fixed and inaccessible. The Galaxy S6 and Galaxy S6 edge were great phones, and it would be great to see their successors fix the almost abysmal battery life that was offered by the original S6 duo.
http://www.sammobile.com/2016/02/03/what-to-expect-from-the-samsung-galaxy-s7-and-galaxy-s7-edge/