Duracell offers a wide range of batteries to be used in electronics that require reliable power. Duracell ultra aa batteries are alkaline batteries ideal for powering all your devices with extra performance for high drain devices. Duracell ultra aa alkaline batteries last up to 100% longer* (*vs. Ordinary carbon zinc aa batteries in 2015 iec tests. Results may vary by device and usage pattern). Available in sizes aa, aaa and 9v. Additionally, duralock technology keeps unused duracell batteries fresh and powered up to 10 years in ambient storage. Duracell's best alkaline proposition for high drain devices, such as digital cameras, photoflash, high powered toys or boomboxes, and of course are great fit for the regularly used devices as motorized toys, flashlights, portable game controllers, shavers, toothbrushes and more. Aa size batteries.