Boeing has completed 20 separate tests of the new system, FAA Administrator Michael Huerta told Congress earlier this week.
The system involved in the emergencies in January had been extensively tested, too.
“We always learn more as we dig deeper into things,” Sinnett said. “We have learned a lot about how to test batteries, and to be conservative” in testing.
Boeing had delivered 50 planes to eight airlines in seven countries when a fire erupted in a battery aboard a Japan Airlines 787 parked at Boston's Logan International Airport on Jan. 7. Nine days later another incident forced an emergency landing in Japan by an All Nippon Airways 787. That prompted the FAA and other authorities to ground the entire fleet.
Boeing said new batteries and kits with the parts for the new battery systems have been shipped to Boeing supply centers around the world and are ready to be installed. The 787s will get the fix in approximately the order they were delivered, Boeing said.
MORE FROM NEWSOK
Boeing slows making 747-8
CHICAGO — Boeing said it will slow down production of its superjumbo 747-8 because of weak demand.
Boeing builds two of the planes every month. It's slowing that rate to one and three-quarters per month.
Boeing had warned that a slowdown was possible if demand didn't improve. Boeing has orders for 64 of the planes still to be built, including freighter and passenger versions.
Boeing first delivered the revamped 747-8 in 2011. The freighter version received the most orders. But the size of the passenger version is midway between the larger Airbus A380, which has been on the market longer, and the smaller Boeing 777, which is popular with airlines.