Article Photos: NTSB: Plane batteries not necessarily unsafe 1/1

FILE - In this Jan. 24, 2013, file photo, National Transportation Safety Board Chairman Deborah Hersman points to a reporter during a news conference in Washington. The use of lithium ion batteries to power aircraft systems isn't necessarily unsafe despite a battery fire in one Boeing 787 Dreamliner and smoke in another, but manufacturers need to build in reliable safeguards, Hersman said Wednesday, Feb. 6, 2013. (AP Photo/Manuel Balce Ceneta, File)