Tibook Battery is stuck - Latch doesn't release

How can fix the latch so that I can release the battery?
Samson wrote on :

I have a titanium powerbook 500MHz model. The latch can only to one side, not the other side that releases the battery. It stops about half way toward the open side.

I've opened the bottom but that doesn't seem to give access to the battery's latch.

How can fix the latch so that I can release the battery?

\samson