During a press conference Sunday, Samsung said two separate battery defects caused both the original batch of Galaxy Note 7 phones and the replacement units to overheat.
The first battery, it said, suffered from a design flaw. The battery's external casing was too small for the components inside, causing it to short-circuit and ignite.
The second battery, which came from another supplier, didn't have the same flaw, Justin Denison, head of product strategy and marketing for Samsung's US arm, said in an interview ahead of the press conference.
In the rush to pump out enough batteries for the replacement units, though, the supplier introduced a manufacturing defect that led to the same result, he said.
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Global business and technology leaders shared some fascinating insights into the 4th Industrial Revolution and how technology is impacting everything around us.
A range of issues discussed included driverless cars, artificial intelligence, the rise of machines as well as a basic income grant as jobs disappear.