The APU and main batteries are quoted as a Lithium Manganese in my 787 gen fam course notes.
I believe the FAA voice many concerns over use of Lithium Ion batteries a few years ago when they were put forward for use on the 787.
Don't know much about them as I'm more familiar with Ni-Cad types.
Last edited by Fargoo; 8th Jan 2013 at 16:06.