New CR-2032 3V with surface mount tabs.
- Size: 20mm x 3.2mm
- Nominal Voltage: 3V
- Cut-off voltage: 2V
- Nominal Capacity: 175mAh/210mAh
Note that these are surface mount tabs, not through hole. The batteries themselves are compatible with NES/NES/N64/Genesis cartridges as well GameCube controller port boards but the tabs would need to be bent/filed to fit.