Rayovac Ultra Pro Alka AAA Batteries Storage Pack of 24 - For Multipurpose - AAA - 1.5 V DC - 12 / Carton Ultra Pro alkaline AAA batteries are specially engineered for professional use. Their reclosable contractor packaging is ideal for contract or bid business. Stackable packaging is easy to store. Batteries offer a long-lasting performance and a 10-year shelf life. Mercury-free manufacturing helps minimize their environmental footprint.