I am not allowed to pull quotes from the R/N thread (I am banned), so I will paraphrase a recent post.
The "cells" are in series. Lose one "cell" lose the "battery".
It is not for nothing the emphasis in the press has been on "cells", instead of "batteries".
Perception is everything. Fire is the dramatic issue, as it should be. The base line is the regulations. Any problem with one "cell" fails the entire SYSTEM.
It is an odd thing to emphasize, but important. Fire is not the problem.
The problem is the certificate, and loss of a safety critical system more often than the regs allow.
Eight batteries in SERIES, Not eight cells.
In protecting against "FIRE", the eyeballs are off the problem.
How many of the replaced batteries had one bad cell? Does it matter? The question is about dispatch, and reliability.
Cannot launch without both batteries at a specific SOC. The rest is spilt milk.