The Energizer Ultimate Lithium AA batteries are not only long-lasting AA batteries they are complete with leak resistance and performance in extreme temperatures. Holds power up to 20 years in storage. They are 33% lighter than alkaline batteries. Series Ultimate Lithium Quantity (8) 1 PK Ansi Neda 24-LF Nominal Voltage 1.5V Chemical Composition Lithium/Iron Disulfide