From the manufacturer's website:
At Duracell, we provide trusted power to those who depend on us to keep their lives charged. Duracell Hearing Aid Batteries are crafted and infused with triple corrosion protection for battery power you can count on. This 8-pack of high performance hearing aid batteries will last in storage for up to 4 years, so you can rest assured that they will be ready when you need them. Each Duracell Hearing Aid battery tab is extra-long, for ease-of-use and simple installation. We're proud to offer you Duracell 312 Hearing Aid Batteries as part of Duracell's trusted lineup of batteries.
Warning: Keep batteries away from children. If swallowed, consult a physician immediately. Battery can explode or leak if heated, disassembled, shorted, recharged, exposed to fire or high temperature or inserted incorrectly. Do not carry batteries loose in your pocket or purse.
*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.