Battery 3,6V, 80mAH 3 Pin for Amiga 2000 and RAM Expansions
Item number VAR6127
This battery is inside many devices such as robot vacuum cleaners, hearing aid and the Amiga 2000 as well as several Amiga RAM Expansions. The difference you have to keep an eye on is the number of Pins. There is a 2-Pin and 3-Pin version.