People briefed on the matter said the F.A.A. administrator, Michael P. Huerta, and Transportation Secretary Ray LaHood were satisfied that Boeing's changes would virtually eliminate concerns that the lithium-ion batteries could erupt in smoke or fire.
Their decision could enable the innovative planes to begin flying again in May after they are refitted with more insulation between the battery cells and a new system for venting smoke or hazardous gases out of the planes.
Aviation analysts said the problems had cost Boeing hundreds of millions of dollars and slowed its progress in fielding the planes, which reduce fuel costs by 20 percent and have been in great demand by the airlines.
The 50 jets delivered so far were grounded worldwide after two incidents in January in which the volatile new batteries caught fire or emitted smoke. Boeing has said the new battery systems are ready to go, and it will install them on the planes it has already delivered before changing the jets still in production.
The government's decision to approve the fixes was not a surprise. The F.A.A.'s engineers oversaw Boeing's design of the changes as well as more than 20 types of tests conducted on them over the last month. Boeing had said that it had successfully wrapped up the tests in a flight by a 787 on April 5.
The approval also will come before the National Transportation Safety Board holds hearings on Tuesday and Wednesday on a battery fire on Jan. 7 in a 787 that was parked in Boston. The board also is examining how Boeing and the F.A.A. underestimated any risks in approving the original battery design in 2007.
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