I think we are talking about the same thing here....
Very complex, holistic, system wide issue...
edit; this just in..
Looks like it worked (for Boeing stock that is)
"Some analysts said the high-tech plane, which was grounded worldwide in January, might be flying passengers again as early as May, after the Federal Aviation Administration on Tuesday approved Boeing's plan to certify the battery system."
Boeing tests prompt analysts' upgrades, but risks still lurk - Yahoo! Finance