FAA orders US airlines to ground Boeing 787 Dreamliners

[triplepoint]

6. Here's a link to discussion on secondary (rechargeable) batteries onboard aircraft

http://www.airliners.net/aviation-forums/tech_ops/read.main/173250

Hope that helps. In the 1970s, I remember hearing about APUs that had NiCds in them. Probably those were updated to NiMH. The use of Lithium in an APU is probably not that common last century. I see no reason to risk the continued use of secondary Lithium-based batteries in anything but say, a drone aircraft.