Battery 3,6V, 80mAH 2 Pin for Amiga 500+ and RAM Expansions
Item number VAR6126
This battery is inside many devices such as robot vacuum cleaners, hearing aid and the Amiga 500+ 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.