@bloodline:
If the battery is leaking it usually looks a bit "furry". Check
this site about leaking clock batteries for some example pictures.
My A501 is soldered together in three places so you will need to be able to handle a soldering iron to open it without mangling it. To make it easy you should be two people doing this. One heats the the solder points one at a time while the other one holds the expansion, applying force to separate the two radio-shield plates at the corresponding solder point, ofcourse one at a time here too

.
Hope this made sense and good luck!
/Patrik