Eveready 1012 Red AAA Battery x 4 SW Pack (Pencil Cell) is Zinc carbon batteries were the first commercial dry cell batteries. The ability of zinc carbon batteries to function in any orientation helped in the development of various portable devices like flashlights, radios and other useful devices. These batteries have a long shelf-life which allows them to retain charge for lengthy durations even when left unused. Quality Seal for Trusted Power. Leak Resistance. Hold power for up to 3 years (when not in use).