Duracell High Power Lithium 123 batteries are made with high-purity lithium with up to 40% more power* for your smart home devices (sensors, keyless locks, smoke detectors), photo flash, flashlights, bike accessories and electronic dog collars. They have up to 10 years of in-storage guarantee with Duralock Power Preserve technology so you can be confident these lithium batteries will be ready when you need them.