Energizer 357/303 Knoopcel Batterij, diameter 11,6 mm, 1,55 V | Staples
Amazon.com: Duracell 303/357/76 Silver Oxide Button Battery, 3 Count Pack, 303/357/76 1.5 Volt Battery, Long-Lasting for Watches, Medical Devices, Calculators, and More : Health & Household