Got a Dell Inspiron 9400...battery is dead. Dodo dead, doesn't even register as being there. Think that I'm covered under warranty, but wondered if anyone had any experience with cheap generic batteries off fleabay? They're a huge amount cheaper, and since I could afford a 9 cell generic (much cheaper than a 6 cell from dell, which is what I already have) even if it's not as good it'll probably still be better than the one I've got (aside from it being dead of course).

Anybody ever used one?