Battery Size Chart

As a consumer, you may have noticed that batteries come in different sizes. From AA to AAA, to D and 9V, it can be confusing to determine which size battery is the right fit for your device. In this article, we’ll go over the various battery sizes and how to determine which one is best for your needs.

Battery Size Chart

Size Typical Usage Diameter (mm) Length (mm)
AAA Remotes, toys, calculators 10.5 44.5
AA Remotes, toys, flashlights, computers 14.5 50.5
C Electronic devices, flashlights 26.2 50.5
D Electronic devices, flashlights, radios 34.2 61.5
9V Smoke detectors, electronic devices 17.5 48.5

What are the sizes of batteries?

There are several battery sizes available in the market, and each size is designed for a specific purpose. Here are the most common sizes of batteries:

  • AAA
  • AA
  • C
  • D
  • 9V

How do you determine the size of a battery?

To determine the size of a battery, you need to look at the battery’s label. Most battery manufacturers print the size of the battery on the label in a letter-number format. For example, AA batteries are labeled with “AA,” while AAA batteries are labeled with “AAA.” If you’re unsure about the battery size, you can always measure the battery’s length and diameter and compare the measurements to the manufacturer’s specifications.

Which battery is bigger AA or AAA?

AA batteries are bigger than AAA batteries. AA batteries measure approximately 50mm in length and 14mm in diameter, while AAA batteries measure around 44mm in length and 10mm in diameter.

What battery size is smaller than AAA?

There is no battery size that is smaller than AAA. AAA batteries are the smallest size of batteries available in the market.


Knowing the different battery sizes is essential when choosing the right battery for your device. Always check the label of the battery or measure it to ensure that you’re using the correct size. Remember to dispose of batteries properly and recycle them whenever possible to protect the environment.

About the author, Phil Borges

Phil Borges is a battery aficionado. He's written extensively about batteries, and he loves nothing more than discussing the latest innovations in the industry. He has a deep understanding of how batteries work, and he's always on the lookout for new ways to improve their performance.