Difference between AA Batteries and AAA Batteries

Updated on February 4, 2017

The regular batteries you can buy at the grocery store are mostly used to power electronic devices found at home. They come in different sizes and are categorized by different letters. The sizes have specific functions and certain lengths of power supply. The ones that are used for alarm clocks, flashlights, and children’s toys are usually AA and AAA batteries. So how do we distinguish between these two? Read on and discover their differences.


AA Batteries
A double-A battery

AA batteries are also called double-A batteries or Mignon, which is French for “dainty.” These are the standard sized single cell or dry cell batteries. They are called dry cell because they have just the right amount of moisture to allow current to pass through. AA batteries produce about 1.5 volts of electricity. This type of batteries can function at any position or orientation without spilling. AA batteries are cylindrical in shape. They measure 1.9 inches in length and 0.53 – 0.57 inches in diameter. They have about three times the capacity of AAA batteries since they are bigger. AA batteries are used for bigger toys and portable equipment.

AAA batteries
Triple-A batteries

AAA batteries are also called triple-A batteries. They provide the same voltage as AA batteries, which is 1.5 volts of electricity. These batteries are also cylindrical in shape but are smaller in terms of length and diameter. AAA batteries measure around 1.75 inches in length and 0.4 inches in diameter. They are mostly used for compact, portable devices like alarm clocks and TV remote controls. Since most electronic gadgets nowadays are designed to be smaller and more efficient, those that used to function with AA batteries now need AAA batteries.

AA Batteries vs AAA Batteries

What is the difference between AA and AAA batteries? These two types of batteries produce the same amount of voltage (1.5 volts). The difference lies in their sizes, usage, and endurance in power supply. AA batteries are longer and wider than AAA batteries. Since they are bigger, AA batteries last longer in terms of power supply when matched up to AAA batteries. AA batteries are oftentimes used for bigger toys and equipment at home whereas AAA batteries are used for smaller, more portable devices.

Comparison Chart

AA Batteries AAA Batteries
Longer and widerSmaller
Usually lasts longerRuns out faster
Used for bigger toys and other equipmentUsed in smaller, more portable devices