No hearing aid battery lasts longer (Based on ANSI/IEC performance tests for size 312). Mercury free. Money Back Guarantee: Contact 1-800-891-6091 or go to www.Rayovac.com/MBG for more details. Restrictions apply. 1.45V. www.Rayovac.com/Rewards. For best results, let a new battery sit un-tabbed for one minute before inserting into device. Replaces: All size 312 Zinc Air batteries. Made in the USA with US and global parts.