ozaub:
Modified battery system certainly looks much safer but Boeing must convince skeptics that it’s at least 200 times more reliable. That's challenging.
Boeing just put the battery in a heavy box and redefined 'safe'. Now, if one cell runs away, its still safe. Since the surrounding components and structure are protected and dangerous gasses will be vented overboard.
Since they still don't understand the root cause of the runaway, 200 times whatever has no meaning. You can't say that this was a statistical anomaly or that we'll be seeing batteries pop every few months from now on. But it won't matter.