How's your soldering skills? If it is a Clock Chip, which is essentially a couple of batteries inside a large plastic box its going to be a job to replace. Speak to Falen5 about it as he has replaced one of those chip on a PC laptop he posted here on the forum some where.

Edit: Found the link:

https://68kmla.org/forums/index.php?/topic/25364-another-pram-problem/&do=findComment&comment=267889