Nintendo 64 Cart Memory Battery:
CR2032

Nintendo Game Boy Advance Cart Battery:
CR1616

Nintendo Game Boy Cart Battery:
CR2025

Nintendo Game Boy Color Cart Battery:
CR2025

Nintendo SNES Cart Memory Battery:
CR2032

Nintendo NES Cart Memory Battery:
CR2032

Nintendo Game Cube Memory Battery:
CR2032

Sega Saturn:
CR2032

Sega Dreamcast:
2032 or LR2030 (NOT a CR2032 as it is not rechargeable)

Sega Dreamcast VMU:
CR2038 (Takes two of them)

SEGA CD Model 2 RAM Battery:
CR2016

 

I will add more as I think of them.