Scrutiny by a materials engineer
The APU battery contains eight lithium-ion cells. The NTSB's examination of the battery's external casing showed that the right side of the case had the most extensive damage. Most of the cells were found to be electrically short-circuited.
March 14, 2013 10:13 PM PDT
Photo by: NTSB
| Caption by: Jonathan Skillings
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