The aircraft took off from Boeing Field in Seattle and spent nearly two and a half hours flying back and forth over the inland Columbia Plateau. It landed at Boeing Field shortly before 3 p.m. PST. According to flight-tracking website FlightAware, the aircraft flew for 1,131 miles, slightly more than the 919 planned.
The Federal Aviation Administration granted permission for test flights on Thursday.
The 787 is the first commercial airliner to rely heavily on lithium-ion batteries, the same kind used in cellphones. Each plane has two of the 63-pound blue power bricks, one near the front to provide power to the cockpit if the engines stop, and one near the back to start up the auxiliary power unit, which is essentially a backup generator.
On Jan. 7, a battery on a plane that had recently landed in Boston short-circuited and caught fire. Nine days later, a battery on an All Nippon Airways plane started smoking, forcing an emergency landing in Japan.
During Saturday's test flight, the crew monitored the performance of the main and auxiliary batteries. Special equipment onboard the jetliner allowed the crew to observe and record detailed battery performance in normal flight conditions, said Boeing Co. spokesman Marc Birtel.
"Data gathered during the flight is considered part of the investigations into the 787 battery events that occurred in January. For that reason, we cannot share any additional details," Birtel said in a prepared statement.
He said more test flights are planned in the coming week.
Boeing Co. has billions of dollars tied up in research on the 787, and billions more dollars in 787s parked in Everett and other sites that are waiting to be delivered.