The Size 13 Hearing Aid Batteries, 8 Count, from Rayovac(R) is the world s longest-lasting mercury-free hearing aid battery and is recommended by 8 of 10 hearing health professionals. Its 2nd generation, mercury-free formula has higher voltage for quick startup while superior cell design resists swelling and leakage to provide optimal performance and greater consistency. The tab is the longest available to make it easy to remove the battery from the package and insert it into the device. The perforated package allows the dial to be removed for convenient transport. The environmentally friendly package is made with recycled or recyclable materials. Remember to let your hearing aid batteries sit un-tabbed for one minute before putting them into your hearing aid. Giving the battery that extra minute allows air to enter and activate your battery.