Energizer® Zinc Air Hearing Aid Size 312 Batteries. Our longest lasting ever! Ez turn & Lock™. +Power seal. Protects your devices from leakage. Of fully-used batteries up to 1 week at room temperature. Improved! Our longest-lasting ever! 1.4V zinc air batts. Replaces all size 312. Zeromercury. 100% Packaging recyclable if available in your area. 1-800-383-7323. www.energizer.com. ©2015 Energizer. Energizer, Energizer Bunny design and certain graphic designs are trademarks of Energizer Brands, LLC and related subsidiaries. TM used under lic./MC Usager lic.