Duracell CopperTop Alkaline AAA Batteries, 240/Carton (DURMN2400B20CT) Case of 12CopperTop all purpose alkaline batteries are not only dependable, they're also long lasting. You can take comfort in a 10 year guarantee in storage. They're great for many of the devices you use daily. From storm season to medical needs to the holidays, you know it's a battery you can trust. Use AAA CopperTop batteries for smoke alarms, flashlights, lanterns, calculators, pagers, door locks, cameras, recorders, radios, CD players, medical equipment,