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The main difference between a AAA and a D battery is the size. With the size, you can put more charge holding materials, such as Lithium-Ion, Ni-Cad, etc. They both have the same voltage output, but the D battery can hold more charge. Since electronic devices "pull" charge from the batteries, the D battery will last longer comparitively to a AAA battery in a similar device. This is why you see AAA batteries used in small devices, that have low current draw, and D batteries are used in items that require more power, such as boom boxes, and such.

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15y ago
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10y ago

If we assume the same battery chemistry and quality, and the same drain, then the AA cell will last longer than the AAA cell, as the bigger size means it'll hold a bigger amount of energy.

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Q: Does AA batteries last longer than AAA batteries?
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