SEOUL — Samsung Electronics’ global recall of its newest smartphone after some of the devices caught fire has put a spotlight on the technology company’s battery-making affiliate.Samsung SDI Co. says it is a supplier of batteries used in Galaxy Note 7 phones, which the world’s biggest smartphone maker has pulled from shelves in one of the smartphone industry’s biggest recalls.Samsung SDI declined to comment on its role or the effect of the recall on its business. Samsung Electronics also relies on another supplier, Hong Kong-based Amperex, Ltd., a unit of Japanese electronic parts maker TDK. An Amperex official said Monday it only supplied batteries for Galaxy Note 7 phones sold in China.Samsung Electronics went ahead with the launch of the new phones in China on September 1 even as it carried out additional quality tests in South Korea in response to reports of some devices catching fire while charging.About 65% of the batteries for the new smartphone were supplied by Samsung SDI, ...

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