Boeing and the Japanese company that makes lithium-ion batteries for 787 Dreamliner disagree about what should be included in a package of measures aimed at returning the aircraft to service.
Battery maker GS Yuasa Corporation believes the fix for the battery should include a voltage regulator that could stop electricity from entering the battery, the Wall Street Journal reported, citing government and industry officials.
Boeing proposed its fix to the US Federal Aviation Authority on Friday.
But on Thursday, Yuasa told the agency that its laboratory tests indicated a power surge outside the battery, or other external problem, started the failures on two batteries, according to the newspaper.
The FAA confirmed the meeting with Yuasa, but did not give any details. A Yuasa spokesman declined to comment.
A Boeing spokesman said that the investigation has not showed that overcharging was a factor and that the 787 had quadruple-redundant protection against overcharging in any case.
“Our proposal includes multiple layers of protection covering the known potential probable causes of the events,” he said.
He added that Boeing was co-ordinating with key suppliers.
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