Duracell® Specialty High-Power Lithium Batteries, CR2, 3 V, 2/Pack (DURCR2B2PK) Pack of 2Duracell High Power Lithium batteries are designed and developed to offer reliable, long lasting power for your specialty devices such as digital cameras, flashlights, motion detectors, security sensors, thermostats, and much more. They will preserve power and are guaranteed in storage for up to ten years in storage, so you can be confident these batteries will be ready when you need them.