ntsb says regulators should reconsider approval of dreamliner battery - lithium ion battery cells

The head of the National Transportation Safety Board said today that the FAA should reconsider the approval of lithium for Dreamliner-ion battery.
Basically, Deborah Hersman, NTSB chairman, said at a press conference that Boeing told the FAA that battery risk proved to be different in practice.
The New York Times explained that Boeing said the batteries on the new 787 aircraft "could emit less than one smoke every 10 million flight hours.
"However, once the plane started flying," Smoke came out of the battery twice in less than 100,000 hours of commercial flights last month.
Not only that, Boeing said any short circuit in the battery would be limited to one battery, according to The Associated Press.
NTSB found that in the case of 787 of the Japanese airlines that caught fire in Boston, "the fire started with multiple short-
One of the eight batteries.
This spreads to seven other cells and produces an uncontrolled chemical reaction called "heat out of control.
"This survey shows that a brief
"Circuits in a single cell can spread to adjacent cells and cause smoke and fire," Hersman said . ".
"Assumptions used to prove the battery must be reconsidered.
"Due to battery problems, since the middle of the year, 50 Dreamliners serving around the world have been grounded.
In January, it caused a major headache for Boeing.