Lightweight complex carbs for your electronics. These lithium batteries are compatible with devices that use AA batteries. . Lithium lasts longer than alkaline batteries longest lasting source other than rechargeable batteries. Weighs 33% less per battery than alkaline. Performance unaffected by temperatures from 40Adeg to 140Adeg ideal cold weather power source. Due to federal shipping restrictions regarding products containing lithium batteries, this product cannot be shipped to Canada, Hawaii, Alaska, Catalina Island, Puerto Rico, APO, FPO or international addresses. Thanks for your understanding.