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. For all SureFire Lithium battery powered lights. 10-Year shelf life. 1200 cells.