Gotta be careful with those batteries. The one in my SE/30 was original, and when I pulled it out, it had a bulge near the positive terminal. Any longer and it probably would have leaked.

I ruined 2 486 motherboards with CMOS batteries... they were the shrink wrapped type that look like they have 3 button cells inside of them. They were soldered to the board and I never thought to remove them. Pulled the boards out 2 years later, and they were ruined.