[Not a pilot--ignore or delete as necessary] My question is what did Boeing have to do to get this approved for production? It's not as if they built the plane and smuggled an illicit battery aboard. If the battery was not defective or installed incorrectly, is it likely that a major failure scenario would have been missed by the engineers/designers under intense scrutiny by aviation authorities?
The FAA simply does not have the technical competence nor staff to certify a complex Part 25 bird. In the case of Boeing birds, Boeing self-certifies under the cloak of government certification.
Same thing happens in France. (and elsewhere.)