The Duracell 309/393 Silver Oxide Button battery is designed to provide reliable power to specialty devices like watches medical devices digital thermometers and other electronics. Duracell 309/393 Silver Oxide Button batteries are guaranteed for 4 years in storage so you can be confident these batteries will be ready when you need them. From storm season to the holidays Duracell is the #1 trusted battery brand. * Brand Name: Duracell Battery Type: Silver Oxide Battery Size: 309/393 Volts: 1.5 V Battery Capacity: 80 mAh Product Type: Electronic/Watch Battery Number in Package: 1 pk Usage: Watches Rechargeable: No Packaging Type: Carded Equivalent to: SR48 SR754W SR754SW SR754 309 393 V309 V393