787 Battery Shows Short-Circuiting

The Boeing 787 Dreamliner battery that caught fire earlier this month in Boston shows evidence of short-circuiting and a chemical reaction known as "thermal runaway," in which an increase in temperature causes progressively hotter temperatures, federal accident investigators said Thursday. It's not clear to investigators which came first, the short-circuiting or the thermal runaway, National Transportation Safety Board Chairman Deborah Hersman said. Nor is it clear yet what caused...Full Story