Since I have upgraded my video card, I no longer need the 6-cell battery. I will be getting the 9-cell battery instead. There is no wear on the battery (Notebook Hardware Control shows 0% wear) as I have only used it once. I've always had it plugged in, pretty much. So the battery is about as good as brand new.
The battery should be compatible with the Dell Inspiron 6000, E1505(6400), 9300, and the E1705(9400).