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Pack failure questions
I'm now 99% convinced that some, if not all 32 dead cells with intact fuses drained past 0V and got reverse charged.
See this for a quick explanation (0:20 ~ 1:10):

Charging the battery in this state could have started a fire.

Takeaway from this incident should be:
1.) properly wire in a BMS so that it can cut the circuit automatically without human intervention
distant 2.) don't undersize cell fuses (don't oversize either)

Mixing batteries of difference capacities is not a big issue as long as you take the differing current per cell into consideration.

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