The Duracell DA13B16ZM09 Easy Tab size 13 battery multipack is suitable for a wide range of hearing aid styles. It has a long tab for easy placement into the battery chamber of the hearing aid. This zinc air battery is mercury-free for environmental compliance, and it has a four-year shelf life when unopened. It is a 1.4 volt battery with 300 mAh total capacity.Duracell manufactures single-use and rechargeable batteries. The company, founded in 1964, is headquartered in Bethel, CT.