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Some hearsay that I'd love have have debunked:
I met a guy that builds lipos for some military systems. He told me he tried the same thing with a larger battery from his company. Hunting rifle caused a dramatic explosion and that 50 YARDS was the min safe distance not including the toxic gasses. Said flame and flash were white. Went on about how he cant believe these things are allowed in cars, let along airplanes.
Once there is a short inside the battery it will get hot enough for the entire thing to melt down and there's not much that can be done to stop it. Chain reaction causes all the battery's energy to be released either slowly or quickly. The larger the short (internal damage) the quicker the discharge and the bigger the explosion.
He said the problem with the 777 battery was that the battery design was faulty and used only a thin layer of plastic to insulate + and -, when that membrane fails battery melts down. He said the cell separation needs to be seriously engineered because it is all that protects from an explosion.
I doubt the FAA and Boeing are so incompetent so would like to hear the rebuttal.
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