Amazon.com : Duracell 309/393 Silver Oxide Button Battery, 1 Count Pack, 309/393 1.5 Volt Battery, Long-Lasting for Watches, Medical Devices, Calculators, and More : Calculator Accessories : Health & Household
Energizer 393 (309, SR754W, SR754SW) High Drain Silver Oxide Watch Bat – Cheap-batteries.com