It could probably be fixed, but it's a lot of work.  There's a good chance the vias are eaten through and the solder joints and traces are corroded.

I attempted to fix one a few years ago.  Managed to get it to boot, but it has issues.  My thread with carnage and attempted repair pics:

https://68kmla.org/forums/index.php?/topic/17191-mac-classic-pram-battery-carnage/