Enegizer Ultimate Lithium AA Battery Four Pack - Perfect for high-tech, high-drain, devices such as digital cameras, MP3 players, portable CD players and wireless headsets. Lasts up to 8x longer in digital cameras, 3.5 hours longer in CD players, 5.5 hours longer in MP3 players compared to leading alkaline batteries. 33% lighter than alkaline batteries. Operates in extreme temps. (-40ø to 140ø F). 15 year shelf life.