Duracell® Quantum AA 12 Alkaline Batteries. #1 world's most advanced alkaline. Hi-Density Core™. The only one with Powercheck™. Duralock Power Preserve™ technology. Guaranteed 10 years in storage. Trusted everywhere. Based on Hi-Density Core™ and Power Check™. Printed on recycled paperboard. No mercury added. Customer Service Number: 1-800-551-2355 (9:00 AM-5:00 PM EST). www.duracell.com. ©2013 Duracell.