I finally got it out but I wrecked the case in the process (sometimes I need to be more patient). I had in fact missed one screw, but ya the trick was to slide it forward first. Not a big deal as this was a spare system I had to muck with.
That said, anyone interested in a Rev 4.5 board with some moderate acid damage???
After my dry run I was able to upgrade the battery on by Rev 6.2 board. Looks snazzy! 
Now I just need to do a recap and this baby is good to go. Thank God these Amigas are through hole components and not surface mount like my old Macs.
Looks good, Is this the AmigaKit coin cell? I think they were looking for a pic of one in a A2000...
