SEOUL — Samsung Electronics has determined that a problem with batteries that triggered a global recall of its Galaxy Note 7 smartphones was not to blame for devices that burst into flames in China. It said their combustion was probably due to unspecified external heat sources.The company launched a preliminary investigation after comments circulated at the weekend on social media about two of the phones sold in China igniting, mirroring complaints by Note 7 users from the US to South Korea. But on Monday, Samsung and its supplier, Amperex Technology, said they found no evidence of a link between its batteries and the fires.Samsung is grappling with its deepest crisis in years: a global recall precipitated by scores of reports that the batteries in its newest gadget are prone to sudden combustion. But the company continued selling Note 7 devices in China, explaining that the power cells for phones sold there came from Amperex Technology and that they carried no defects."Samsung has ...

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