Optimized for use in SureFire flashlights, SureFire lithium batteries pack a lot of power into a small package. And unlike alkaline batteries SureFire high-performance lithium batteries boast a ten-year shelf life, which means they will be ready when you need them, every time.Features :High-performance batteries, optimized for high-drain flashlightsWide temperature toleranceBuilt-in heat and fault (short-circuit) protection