NTSB: Dreamliner batteries not necessarily unsafe

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Despite a battery fire in one Boeing 787 Dreamliner and smoke in another, the type of batteries used to power the plane's electrical systems aren't necessarily unsafe — manufacturers just need to build in reliable safeguards, the nation's top aviation safety investigator said Wednesday.

National Transportation Safety Board Chairman Deborah Hersman said she doesn't want to "categorically" rule out the use of lithium ion batteries to power aircraft systems, even though it's clear that safeguards failed in the case of a Japan Airlines 787 that had a battery fire while parked at Boston's Logan International Airport last month.

The board is still weeks away from determining the cause of the Jan. 7 battery fire, Hersman said.