The Rayovac Zinc Air battery has a long-lasting formula provides consistent, high-quality performance throughout the life of the battery;Keep your hearing device operating efficiently with Rayovac brown type 312 long-lasting and Mercury-free hearing aid battery;This superior cell design resists swelling and leakage in your hearing aid battery keeping it in top shape;Each battery tab is long, wide and easy to handle making it easy to install;Recycle with us! Bring your old dead batteries to your local Batteries Plus location for proper disposal. Fees may apply.