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NTSB rules out excess battery voltage in 787 incident

TOKYO/WASHINGTON (Reuters) - The U.S. National Transportation Safety Board on Sunday ruled out excess voltage as the cause of a battery fire last month on a Boeing Co 787 Dreamliner jet operated by Japan Airlines Co (JAL) and widened its investigation to include the Arizona-based manufacturer of the battery's charger. ( 更多...

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Well before the dawn of 20th century , the auto manufactures had developed such voltage regulators which controlled charging voltages for the lead batteries used in the cars or buses . These regulators were of such design that as soon as the battery started achieving charge , the charging current started going down . This was to protect the charging dynamo from over loading as well as to protect the battery from over charging ( over heating ! ) . This technology is well over 140 years old or so . I wonder what did the Aviators ( engineers and managers ) learn in all these years !
Matt Molnar -2
(Duplicate Squawk Submitted)

787 Fire Investigation Now Focusing On Individual Battery Cells: NTSB

Investigators looking for the cause of January 7's Japan Airlines Boeing 787 fire in Boston are working through the three-day weekend.


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