but I would add that the device causes interference with my car stereo (sizzle, loss of radio frequency). Of which there is a bad "shield" of electronics somewhere ... This limits (some) use during long trips.
Edit 07/01/2013: Following this comment, I was contacted by Anker shortly before Christmas and after some discussion / tests / pictures my product was replaced :-) Still, the first tests with the new battery will a somewhat in the same direction :-( I will try to replace the original output cable with a ferrite ...