 In the original run of devices, the battery, produced by Samsung SDI, contained a design flaw that made electrodes on the top-right of the battery susceptible to bending.This weakened separation between positive and negative tabs of the battery, thus resulting in thermal runaway and short circuits.Following an official recall on 12 September 2016, the Galaxy Note 7 was re-versioned using batteries from China-based Contemporary Amperex Technology (CATL or ATL), which also supplies batteries to the iPhone smartphones.