What is the Difference Between AA Battery and AAA Battery?

The main difference between AA and AAA batteries is their size, which directly affects their capacity and the devices they are used in. Here are the key differences between AA and AAA batteries:

• Size: AA batteries are larger than AAA batteries. They have dimensions of approximately 14.5 x 50.5 mm, while AAA batteries have dimensions of about 10.5 x 44.5 mm.
• Capacity: Due to the larger size and more electrochemical material, AA batteries generally have a higher capacity than AAA batteries. For example, AAA Li-FeS2 batteries have a typical capacity of 1100-1300 mAh, while AA Li-FeS2 batteries have a typical capacity of 2700-3300 mAh.
• Usage: AA batteries are suitable for high-power devices, such as toys and electric torches, while AAA batteries are suitable for small and low-power devices, like clocks and remote controllers.
• Chemistry: Both AA and AAA batteries have the same overall chemistry, with similar types of anodes, cathodes, and electrolytes.

Despite their differences in size and capacity, AA and AAA batteries share the same nominal voltage of 1.5 volts.

Comparative Table: AA Battery vs AAA Battery

The main differences between AA and AAA batteries are their physical dimensions, charge storage capacity, and the devices they are commonly used with. Here is a comparison table highlighting these differences:

Both AA and AAA batteries have a nominal voltage of 1.5 volts and are available in various chemistries, each offering different discharge characteristics. However, due to their differences in size and capacity, AA batteries generally provide stronger discharge currents and are used in devices that require more energy, while AAA batteries are used in devices that consume less energy.