Probable cause
If deep discharge in one cell was the beginning of the thermal runaway of one cell, what was then the cause of this rapid deep discharge? Could the modifications in the box ---- better isolations of the cells itself and between the cells, of the wires, and the moisture draining capability ------- point to a moisture and isolation problem of the old box?
condensation causing a short between the box and one cell (remember the contact of one celll completely gone at the ANA event)? In such an event the evidence would evaporate due to the heat and no trace be left.
The new sealed box could prevent such an event by being airtight until a defined overpressure opens the new vents.
Last edited by RetiredF4; 17th Mar 2013 at 22:25.