The AAA, AA, C and D are cylindrical batteries varying in size, power rating and intended applications. Manufacturers choose the battery that best fits the size and power needs of their products.
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The AAA batteries are the smallest of the group at 10.5mm in diameter and 44.4mm tall. They progressively increase in size through AA and C to the largest, D, at 43.2mm diameter and 61.5mm high.
Intended Daily Use
Double and triple A batteries are designed for one hour of use per day. The C and D ranges are used in short bursts over longer periods, C batteries being used for four minutes per hour, for up to eight hours per day, and D for up to four minutes in every quarter hour, for a total of eight hours per day.
The AAA and AA batteries have average minimum lifespans of 5 1/2 and six hours, respectively. The larger C should last for at least 13 to 14 hours, and the D for about nine hours in total.
The lowest power ratings are AA and AAA batteries with a nominal 1120 and 2450 milliamp hours (mAh) each. C batteries are more powerful at around 7800 mAh . The D is the most powerful at 16500 mAh.
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