Duracell Silver Oxide Button batteries have a 4-year guarantee in storage, so you can be confident these batteries will be ready when you need them. They offer long-lasting power for your specialty devices such as watches, calculators and medical devices. Duracell Silver Oxide Button batteries are crafted and infused with triple corrosion protection for battery power you can count on. And you can be assured that they're batteries you can trust because Duracell is the #1 trusted battery brand.