@mm43
Having reviewed parts of the Day 1 NTSB hearing, and looked at the rough transcription; it seems that no one has questioned the over-voltage charging regime, nor the CV trickle charging.
The transcription mentions the cell OCV as 4.55V, then a little later reconfirms this figure by stating that for the battery - Quote:
We also do a test where we charge at 36 volts for a long time
So, it would appear that the 36V [36.4] figure has been redacted from the Airworthiness Excerpts now released.
I doubt they production test at 4.55V Per cell, as it would do irreparable damage and set cells up for failure within a short time - seconds - thereafter.
Actually, FDR at BOS shows charging after the first cell beginning to short - up to 4.57V for the remaining 7 cells - 32 / 7.