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I recall an old article about these batteries (https://electrek.co/2016/12/19/tesla-fire-powerpack-test-saf...) in which testing showed that a failure within the battery itself would be contained by the cooling system, but a failure outside it wouldn't. Since the fire in the pictures on this article doesn't look contained, I wonder whether the cooling system was turned off at that moment (because it was not yet in operation, or because it was turned off after the failure started), or whether the fire started outside the battery modules (for instance, in the wiring).



I suspect a wiring fault. All it takes is one connector to fall into muddy ground during installation, and now you have a nice high resistance path ready to get red hot as soon as the system comes under full load.


Or even more likely - safety claim was too optimistic.




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