It looks like the Samsung Galaxy S7 edge will have quite a large battery, according to FCC documentation. It seems that the phone will sport a 3,600mAh battery, a large increase over the 2,600mAh battery found in last year's Galaxy S6 edge. This information comes from the FCC's label location document, which details where a device's FCC certification ID will be placed. The FCC e-label for the Galaxy S7 edge will be found on the device's Battery info screen.
Along with the Galaxy S7, the S7 edge passed through the FCC last week. The Galaxy S7 has the model number of SM-G930A, while the S7 edge is model number SM-G935A. Versions of each phone have been certified for each of the major U.S. carriers.
The Galaxy S7 and S7 edge are expected to be announced at an event on February 21 in Barcelona, just a day ahead of Mobile World Congress 2016.