In studying the design and layout of the Note 7 internals some engineers are saying Samsung sacrificed safety to make the Note 7 thinner. The group of engineers from Instrumental noticed that the margin for the battery bay of the Note 7 was dangerously thin. The device actually needs a bit of space to expand and contract over the life cycle of the battery. Without the bit of extra space the battery had no room to swell which may have caused positive and negative electrodes to touch as the battery was squeezed. If the chemicals touched it would cause the battery to catch fire. This is one theory which actually seems to make since. Hopefully Samsung has a firm grasp of the cause of the exploding batteries before the S8 is released.
via Instrumental