Energizer® Ultimate Lithium™ Batteries, Nothing outlasts Energizer® Ultimate Lithium™ AA batteries. The Energizer® UltimateLithium™ batteries are the #1 longest-lasting AA batteries – complete with leak resistance and performance in extreme temperatures (-40ºF to 140ºF or -40ºC to 60ºC). To ensure your favorite devices operate at their peak performance, depend on Energizer® UltimateLithium™ batteries for work, play and home. Energizer Ultimate Lithium™ batteries are 100% leak proof* *Based on standard use