What’s the difference between AAA (3A) and AA (2A) batteries? Which one is good to use?

Many electronic devices today use batteries to operate with two common types of AA batteries and AAA batteries. So what are these batteries, which devices are suitable for and what is the difference between 2A and 3A batteries, see this article to better understand!

AA batteries (2A)

The AA battery (2A battery) is a standard sized single cylindrical dry cell battery with a length of 49.2 – 50.5mm (1.94 -1.99 in), including a button at the top of the battery, and a diameter of 13.5 – 14.5mm. (0.53 – 0.57 inches).

AA batteries include a single charge battery that can be a primary (disposable) battery or a rechargeable battery multiple times. The exact terminal voltage and capacity of an AA size battery depends on the chemistry of the battery.

Currently, this type of battery is often used for portable electronic devices or specialized devices such as wall clocks, computer mice, cameras, remote controls, children’s toys, .. Some AA battery brands of reputable brands you can refer to include: Philips, Panasonic, Sony,…

4 AA alkaline batteries Philips LR6P4B belongs to the type of 2A battery commonly used for watches, radios, battery-powered keyboards, …

AAA battery (3A)

AAA battery (3A battery) is a standard size, dry cell battery commonly used in portable electronic devices. In particular, AAA batteries will be smaller than AA batteries with a length of 44.5mm (about 1.75 inches) and a diameter of 10.5mm (about 0.41 inches).

AAA batteries are good for products that require a lot of power and are used for a number of electronic devices including: remote controls, MP3 players, digital cameras, hearing aids,…

Some AAA battery brands belong to long-standing, prominent manufacturers that you can refer to when choosing to buy such as: Panasonic, Philips, Energizer, …

Panasonic R03NT-2B Manganese 2 AAA batteries are 3A batteries commonly used for remotes, digital cameras,…

Compare AA and AAA batteries

Battery type	AA batteries	AAA battery
Characteristic	Larger size than AAA battery. Weight is heavier than AAA batteries. Longer use time than AAA batteries.	Smaller size than AA batteries. Lighter weight than AA batteries. Battery life is faster than AA batteries.
Capacity	Popular battery capacity levels: 700mAH , 900mAH , 2300mAH ,… The battery capacity is larger than AAA batteries.	Popular battery capacities: +/- 175 mAh , +/- 900 mAh , +/- 2300 mAh ,… Battery capacity is smaller than AA batteries.
Size	Length from 49.2 – 50.5mm (1.94 -1.99 inches). Diameter 13.5 – 14.5mm (0.53 – 0.57 inch).	Length 44.5mm (about 1.75 inches). Diameter 10.5mm (about 0.41 inch).
Equipment used	Used for electronic devices that consume a lot of energy such as: wall clocks, control devices, computer mice, cameras, …	Used for electronic products, or small devices with low energy consumption such as: remote controls, MP3 players, digital cameras, hearing aids,…
Price	Price from 10,000 – 45,000/2 tablets (price updated on 11/02/2023, may change from time to time).	Price from 10,000 – 45,000/2 tablets (price updated on 11/02/2023, may change from time to time).

What kind of battery should I buy?

Use AA batteries when

You should choose to buy AA batteries when you:

• Need to be used for common everyday devices such as: TV remote, air conditioner control, wall clock, …
• You want to use a battery with a high capacity, long life at a cheaper price.

2A battery with large capacity, durable use time

Use AAA batteries when

You should prioritize buying AAA batteries when you:

• Needed for small devices such as MP3 players, digital cameras, hearing aids,…
• You want to use a battery with a small charge, suitable for some special equipment, that requires little power.

3A battery is recommended when you need to install it for small, low-power equipment

This article helps you understand a few more facts about AA and AAA batteries, as well as the differences between them. Hope this information will help everyone in the process of using electronic devices every day!