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The way to get a estimate on what your battery life should be is for you to test the battery. Browse our large selection of hearing aid batteries. This "Power One air batteries (1. 45V )" is the ideal power supply, especially for today ½s digital hearing aids. The air holes of the battery are initially sealed with a protective tab. They are kept in an "inactive state" until they are needed. It can only be stored for a particular period and should be used as quickly as possible once the film is removed. Features: voltage: 1. 4 volts capacity: 100 mAh chemistry: air 1 year warranty replaces: pr70, b010, b20pa, 10hp, da10h, da10n, ac230e, ac230ez, ac10, ez10, me10z, pr230h, p10, 10ae, l10za, 10a, za10, 10sa, s10a, w10za and a10. Compatible: hearing aid devices.