Machinbird
After looking at the picture of the exemplar battery in the NTSB report, one thing puzzles me about the smaller monitoring wires. There appear to be 3 wires that are attached to electrically potential-equivalent points on each inter-cell junction.
There was a brief explanation in post, #177 but put more simply, the use of
two wires to each cell isolates that cell measurement from any interaction with
the other cell voltages and currents.
Also, wires may be dualled in some places to provide redundancy against a
single wire break. This would also allow diagnostics to detect a broken wire.
Such dualling is not uncommon...
Regards,
Chris