25 Year Shelf Life

Energizer AA(20 packs by 2) batteries are available in two primary chemistries for medical applications. Alkaline AA (model X91, E91) provides a nominal 1.5V output, 23g weight, 150-300 milliohm internal resistance, and 7-year shelf life, with zero added mercury. Ultimate Lithium AA (model L91) provides 1.5V output, 15g weight, operates from -40°C to 60°C, offers 3000 mAh capacity, 2.5A continuous discharge, and 25-year shelf life. Both are manufactured under ANSI and IEC standards (ANSI-15A, IEC-LR6 for alkaline; ANSI-15-LF, IEC-FR6 for lithium). For clinicians, alkaline AA is recommended for Medtronic insulin pumps; lithium AA is indicated for high-drain, extreme-temperature, or long-storage applications. Contains zero added mercury or cadmium. Ingestion requires immediate medical attention (800-498-8666).