H2
Le bus probably will dispute that premise.
The current problem is interesting as it has had a cluster in service that was not "apparently" evident during the flight test program, assuming the rear E/E fire in the test program was wiring related, not initiated by battery characteristics. Would be worth a review of that event to see if group think occurred in the FTA.
Interesting article posted earlier, seems to be saying that the specific type of Li-Ion batteries fitted to customer delivered aircraft differed from those originally fitted to test/certification aircraft:
Boeing looks to boost 787 lithium ion battery service life
Excerpt from above link:
"Boeing has not determined which 787 will be the first to receive the new battery modifications, although multiple programme sources have told Flight's FlightBlogger affiliate that the new battery could be introduced as early as Airplane Seven, the first production 787 scheduled for delivery to All Nippon Airways in the third quarter of 2009."