Lithium batteries the culprits in Samsung Note 7 debacle, company finds

It was overheating Samsung Galaxy Note 7 incidents that prompted a worldwide recall and months-long investigation by 700 Samsung engineers.
Over 200,000 devices and more than 30,000 lithium-ion batteries were tested.
Samsung found that a design defect — incorrect battery positioning in the Galaxy Note 7’s upper right corner –caused the first wave of problems.
Then some replacement devices had a manufacturing error; An abnormal weld that led to internal short circuits.
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