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 worlds first mercury free hearing aid battery and 100% recyclable packaging to responsibly power you with less impact on the environment. *vs. Energizer 2011 product, based on high-drain performance.