G13 (SR44) Silver Oxide 1.5 V Watch/Game/Camera Battery
Exell Battery Silver-Oxide SR44 Button Batteries in the Coin & Button Batteries department at Lowes.com
Panasonic SR44 Silver Oxide Button Cell for Watches, Calculators, Electronic Keys, Medical and Other Small Devices with High Energy Requirements, Type SR44, 1.55V, 1 Piece : Amazon.se: Electronics
Simply buy Battery SR44 1.5V 1 Stk | Hoffmann Group