| ...
| * Boeing outsourced both the analysis and testing of the
| battery system's safety to its subcontractor, Thales of
| France, and to the battery maker, GS Yuasa of Japan.
| ...
| * Testing of the battery charging unit (BCU) system was
| done by a Thales sub-contractor, Securaplane of Tucson,
| Ariz.
|
| Early developmental testing of this system resulted in a
| major battery fire in 2006 that burned down a Securaplane
| building. After this, actual batteries were used only for
| isolated tests, with most of the testing instead using
| equipment that provided an electrical load representative
| of what a battery would provide.
|
| The NTSB notes that there doesn't seem to have been any
| testing of the charging system and battery together as an
| integrated system inside the airplane.
| ...
http://seattletimes.com/html/businesstechnology/2020505762_ntsb787reportxml.html

--bks