MN1604B4. Guaranteed 5 years in storage. No. 1 trusted brand. Guarantee: If not completely satisfied with this alkaline battery product, call 1-800-551-2355 (9:00 am-5:00 pm EST). Duracell guarantees these batteries against defects in materials and workmanship. Should any device be damaged due to a batter defect, we will repair or replace it at our option. www.duracell.com. Contains from US or foreign countries as marked on battery.