Samsung blames two separate battery faults for Galaxy Note 7 fires

Tests on tens of thousands of devices found that both original and replacement batteries were responsible for the phones bursting into flames

Samsung has blamed lithium-ion batteries for causing its Galaxy Note 7 mobile phones to overheat and catch fire, a fault that led to the global recall of millions of devices and damaged consumer confidence in the world's biggest maker of smartphones.

At a press conference on Monday, Samsung officials said exhaustive tests on tens of thousands of devices and batteries had ruled out any problems with the device's hardware or software.