SureFire Sf123A Bulk Box 400 CellsOptimized for use in SureFire flashlights, SureFire high performance lithium batteries pack a lot of power into a very small package. And unlike alkaline batteries, SureFire provide a 10 year shelf life, which means they will be ready when you need them, every time. Trust in the power and durability of SureFire lithium batteries Best 123A lithium batteries available 123As outperform alkaline batteries 10 year shelf life, ready when you need them 400