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How A Tight Fit Doomed Note7

US engineering consultancy firm Instrumental believes it has found why Samsung’s now defunct Note7 phablet was catching fire. It says there was too much battery packed into too small a case

The Note 7 battery was made up of a positive layer of lithium cobalt oxide, a negative layer of graphite and a layer to separate the two materials.

The middle layer allowed energy to flow between the positive and negative layers. But if those layers touched. it would cause the battery to overheat and explode.

Instrumental said that adding pressure on the battery, such as a user sitting on the phone, could be enough to squeeze the layers together causing them to touch, overheat and catch fire. Samsung has declined to comment.

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