Dreamliner investigation finds damage to battery - lithium ion battery cells

Earlier this month, an American investigation into the fire on a Boeing Co 787 Dreamliner in Boston found the battery damaged.
The National Transportation Safety Board said tonight that its investigation showed that a special lithium had some thermal damage to all eight batteries.
Ion batteries used to generate auxiliary power supplies for aircraft.
According to the NTSB press release, Deborah Hersman, chairman of the Security Council, and other NTSB officials will provide an update on the investigation at tomorrow's press conference.
On Sunday, the agency ruled out that overcharging was the cause of the battery failure.
The meaning of thermal damage referenced by NTSB is not clear.
NTSB said the battery made by Japan's GS Yuasa Company has 8 3-cell batteries.
Each of the 7 volts, 8 have different degrees of thermal damage.
Investigators performed CT scans and dismounting of six of the eight cells, and their electrodes were taking pictures and examining under a microscope, the agency said.
The remaining two batteries will be checked in the same way in the agency's Washington lab in the coming days.
NTSB said in a brief statement that the members of the investigation team have also been working in Arizona, Seattle and Japan without providing any additional details.