Boeing Co. said on Monday that the first flight test of its reworked battery system for the 787 Dreamliner went "according to plan," enabling it to move on to formal testing.

The successful mission means Boeing can conduct a second flight test that will gather data for the Federal Aviation Administration, which must approve the new system before the 787 can be used for commercial service.

Regulators grounded the global fleet of 50 Dreamliners in January after a battery burned aboard a jet on the ground in Boston, and a second battery overheated on a flight in Japan.

"During the functional check flight (on Monday), crews cycled the landing gear and operated all the backup systems, in addition to performing electrical system checks from the flight profile," Boeing spokesman Marc Birtel said in a statement.

The flight carried six crew members: two Boeing pilots, two instrumentation engineers, a systems operator and a flight analyst, Boeing said.

"More than 600 of these functional check flights were completed in 2012 across Boeing commercial airplane programs."