From the video point of view, there are actually two iPhone X internal battery, a vertical L-shaped arrangement, to maximize the use of the fuselage internal space.
In fact, when the iPhone X is not yet released, there is news that the machine uses a dual motherboard design, and the use of L-shaped battery, the video is now partially confirmed this view.
IPhone X will be officially on sale tomorrow, there will be more dismantling reports coming, the aircraft's internal structure will be better understood.