Papasan - various threads on the LiIons in the battery section and such - quite some guys already got some and successfully tested them to work just fine.
So far most people I´m aware of orderd at WargameClub in HK.
@Yclo - thanks for the nice offer - and I´m not in a hurry -- lets see if some CPF-er from HK joins the discussion - if nothing happens and summer vacation approaches we talk / post again.