Duracell Special Alkaline batteries have a 5-year guarantee in storage with Duralock Power Preserve Technology, so you can be confident these batteries will be ready when you need them. They offer reliable, long-lasting power for your specialty devices. Up to a 5-year guarantee in storage with Duralock Power Preserve Technology #1 trusted brand of pharmacists and medical & office professionals Triple corrosion protection; Contains 0% mercury Perfect for specialty devices