Energizer Ultimate Lithium batteries

• Up to 11× longer battery life in Digital Still Cameras vs Energizer Standard Alkaline
• Long 20-year storage life
• Weighs 33% less versus standard alkaline batteries - so you carry less with you
• Stable performance in extreme temperatures - from -40°C to +60°C - so you can do more wherever you go, no matter how hot or cold it gets
• Leak-resistant construction — so you never need to worry

Gone Running says - You simply can't justify the extra cost for training runs, but these little bad boys are great for races where power-to-weight ratios are important. Despite the packaging claims, we find they last maybe 2x longer than alkalines, but at a third lower weight too. Definitely recommended for UTMB and UTMF, as alkalines can really go to pieces under 0C.