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What caused Samsung Galaxy Note 7s to burst into flames?

Answer: it was a two-fold problem: The batteries were too large for their case and there was a defect produced by the battery supplier, both of which caused overheating.

Samsung released a report Jan. 22 to announce what caused the Galaxy Note 7 to overheat and catch fire. Business Insider reported that the problem impacting the first batch of the devices was blamed on the battery being too large for the phone’s case. And when the company went to replace that batch, the new battery had a defect, which also caused it to overheat. All of the Galaxy Note 7s were recalled and the product was pulled from the shelves.

To ensure this does not happen again, Samsung announced an eight-point battery check — which includes an X-ray to look for abnormalities in the battery — for future devices.

The Daily Mail reported that the Galaxy Note 7 disaster cost the smartphone maker $5.3 billion in lost profit and reputational damage.