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Now lasts up to 4 hours longer! This easy, convenient packaging has a dial that is easy to turn, yet the lock and the "click" lets you keep your hearing aid batteries precisely where they need to be to dispense - or stay put. No free-wheeling batteries falling out in drawers and purses with this package! Energizer has the world''s first mercury free hearing aid battery and 100% recyclable packaging to responsibly power you with less impact on the environment.