Surefire, Battery, CR123A Lithium, 2 Pack, Red

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.
High-performance batteries, optimized for high-drain flashlights
Wide temperature tolerance
Built-in heat and fault (short-circuit) protection