Duracell CopperTop Alkaline AA Batteries, 4/Pack – Long-life alkaline AA batteries provide the best, longest power source. Operate reliably in temperature extremes of negative 20 degrees Celsius to 54 degrees Celsius. Recommended for use in smoke alarms, flashlights, lanterns, calculators, pagers, door locks, cameras, recorders, radios, CD players, medical equipment, toys and electronic games. Dependable after seven years of storage.