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A comment on Why a plane turned around when a passenger lost a phone midflight. Parent comment

Re:Why a plane turned around when a passenger lost a phone m... by andrewaylett on Sunday March 30, 2025 @02:51PM (#43526516)
I assume this is because the thermal containment bags they have are only rated to a certain limit, but distinct batteries hopefully won't ignite at the same time and can in any case go in different bags?
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Re:Why a plane turned around when a passenger lost a phone m... by LorenPechtel on Monday March 31, 2025 @08:16PM (#43541472)
Heat a lithium secondary cell too much and it goes into runaway. When the cells are packed together in one device if one of them goes up it can take the others with it. The bigger the device the hotter it will be and harder to avoid it turning into a disaster.
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