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Samsung finds battery design, manufacturing issues caused Note 7 fires

As expected, Samsung Electronics Co. Ltd. said that an investigation of its Galaxy Note 7 found that a defect in the design of the batteries and manufacturing issues caused the smartphones to overheat and catch fire.

The Note 7 launched in August 2016, with a global recall issued less than a month later following multiple reports of the devices catching fire. The complaints continued with replacement units, leading the Samsung Group unit to scrap the phone completely in October 2016.

Defects introduced during the design and manufacturing phase caused a short-circuit that resulted in the overheating and fires. The batteries used in the device at launch came from Samsung unit Samsung SDI Co., Bloomberg News reported Jan. 23. After the recall, the company switched to a different supplier, Amperex Technology Ltd., but those batteries also became malfunctional amid the rush to produce replacement phones.

Samsung's investigation was conducted in partnership with UL LLC, Exponent Inc., and TÜV Rheinland Group.

The company said it was taking "several corrective actions" to ensure the incident is never repeated.