Its interesting to speculate about the battery failure modes and possible design improvements. But what is the service experience with the GS Yuasa LVP65 battery in other applications? Good? Bad?
If it is good, what is Boeing/Thales doing that other users are not?
In the final analysis, any technology will fail (spectacularly or otherwise) if pushed beyond its limits. If Boeing can't identify the particular conditions that exacerbate the failures, how can they be trusted to certify another design?