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Why are there so many explosions been reported in the mobile phone industry?

April 26, 2017explosions Industry Mobile Phone reported

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Why are there so many explosions been reported in the mobile phone industry?

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When an adaptor (not a charger) is used to charge a lithium-ion battery pack, the safety of the pack is relied on the protection circuit board heavily. When the PCB fails to shut down a charge, explosion may occur. Although the chances for the PCB to fail is very low (e.g., 1 out of 1 million), 350 million new mobile phones a year can make many cases.