congrats!
i found one recently too that had been used as a toaster workstation at a nearby university... my battery luck was not so good though :-(. removed it, tried replacing it, but it seems that the battclock hardware has been messed up from the corrosion. :-(
anyway, be sure to keep all the original screws, because one knows these aren't mint anymore without the original fasteners. :-)
also! if you haven't already, read warren block's a4000 hardware guide. definitely useful information for newcomers to the a4000...
http://wonkity.com/~wblock/a4000hard/main.htmlcheers,
trilobyte