The SureFire SF123A Batteries are optimized for use with SureFire flashlights that take 123A lithium batteries. For maximum performance from your SureFire flashlight, trust original SureFire batteries. With an exceptional battery life and a 10-year shelf life, these batteries will not let you down. They feature a wide temperature tolerance, so they will not fail in extreme climates. These batteries are more powerful than traditional batteries of the same design, specifically because they are intended to power SureFire lights. They are compatible with any SureFire flashlight that accepts lithium power and promote high-performance illumination. Stronger and longer-lasting than standard alkaline batteries, these lithium batteries will be ready whenever you require them.