li-on battery described below are not Lithium iron phosphate (LiFePO4). which are inherently stable and very hard to cause a fire. unfortunately one cannot say the same for lithium cobalt Li-on batteries.
note lithium polymer batteries can be molded into almost any shape to take advantage of existing space.
Boeing is confirming that a fire on one of its new 787s appears
to have started in a battery, as scrutiny of the problem increases.
Also Tuesday, the National Transportation Safety Board said it will send two more investigators to Boston to examine the Japan Airlines plane. The NTSB says the battery had "severe fire damage."
The fire happened on the ground Monday, with no passengers on board. But in-flight fires can be catastrophic, so the matter is getting close scrutiny by aviation authorities.