FlightPathOBN:
The NTSB a month ago established that the fire instead started with an internal short circuit of a single cell in the eight-cell battery.
Boeing’s pre-certification testing did try to evaluate the effect of an internal short circuit. It chose to do so with a test that punctured a cell with a nail to induce a short circuit.
“This test resulted in venting with smoke but no fire,” the NTSB reported.
But was the cell inside a closed battery compartment with 7 other warm cells at the time? Or even insulated to confine the released energy?
And was the charging system pumping 45 amps in throughout?
