Battery CP234044 works in the Starkey Surflink Model 100 & 610 Remote.

CP234044 Generic Battery 3Volts, 700 Mah.

Measurements (LxWxH): 48 x 38 x 2.3 mm.

Backup battery for heaters, micro-controllers, for use in weather stations,  Starkey Surflink Remote 100 & 610!

Buy a spare before they are all gone.