AA vs AAA Batteries – What Is The Difference?

The main difference between AA and AAA batteries is that the AA battery is about three times the size, while the AAA puts out about 1/3 of the energy capacity of the AA battery.

The AA and AAA batteries are two of the most popular types of batteries. They may be utilized for a range of appliances and devices such as remote control cars, LED lights for your home, smoke detectors, and many more. Knowing the differences between these two batteries is important so you can choose the right one for your specific device. Here’s a quick guide to what you need to know about the difference between AA and AAA batteries.

Physical Size and Appearance: This is the first noticeable difference between these batteries. The AA and AAA battery size may look very similar, but they are different in size. The AA batteries are more petite than AAA batteries, with an average length of 50mm and a diameter of 14mm. AAA batteries measure 45mm long by 10.5mm in diameter.

Energy Storage: This is another difference you can see. The AA batteries have more energy storage than AAA batteries because they are larger and will last longer. However, if the device requires a smaller amount of power, then an AAA battery may be sufficient for your needs because it’s much smaller and easier to fit in small places where the AA battery cannot go.

AA batteries are typically more powerful than AAA. They last up to eight hours and can be found in a wide variety of devices such as televisions, video games, and photography equipment like digital cameras.

AAA batteries are less expensive but also less powerful than AA. They can last up to 10 hours on average and are essential for things like radios, watches, and TV remotes.

Battery Capacity: Although both AA and AAA batteries have the same output voltage at 1.5V for disposable ones and 1.2V for the rechargeable types, usually NiMHs, they still differ in capacity. The AA battery has a higher capacity than AAA, which means it can store more power. An alkaline AA battery can store up to 2400mAh (milliampere-hour), while an average alkaline AAA battery stores about 800 – 1000 mAh.

How to find the best deals on batteries, like AA and AAA brands?

There are always ways to get the best prices on batteries. First, it is best to check out the internet because many websites will offer coupons and discounts that can be used on batteries. Additionally, one of the easiest ways to save money is simply buying in bulk for products like this. For example, if you buy four AA batteries at once with a coupon code, then you’re most likely going to get them cheaper than if you bought just one.

Batteries can be a bit confusing to people, but it’s important to remember that even the smallest details matter when purchasing them because they have an influence on how long your batteries will last and how efficient they are in general.

Is it safe to use AAA as a replacement for AA batteries?

There are some valid reasons why you can’t use AAA batteries as a replacement for AA batteries. One of these reasons is the size of the battery compartment of a device. Generally, the AA batteries are bigger and won’t fit in the AAA battery compartments. Batteries are carefully designed for their own purposes and require a perfect fit to work properly. If the batteries are not perfect, they may short circuit and even explode or cause a fire hazard.

However, in the event of an emergency where you had no other option but to use AAA batteries in a device that requires AA, there may be a trick that could help. There are those who have tried to fill in or bridge the gap in the positive side of the batteries with a small wad of aluminum foil. Although this approach is not ideal, it may work as long as the existing draw does not exceed the AAA’s capacity. There are even adapters to enable you to do it without having to pound aluminum foil.


There are numerous things to think about when choosing the best battery for your needs. AA batteries are compatible with more devices, but AAA can be used in smaller ones. The choice on which one to buy all comes down to preference in terms of size, strength, reliability, cost-effectiveness, and how much power your device needs.

When you buy batteries, it is important to consider what devices you plan on using them with and how often they will be used in order to get the most out of your investment. Choosing the best battery for your device is important because this will impact the life of the device. Understanding the differences of each battery can help you make the best choice and know the perfect fit for your gadget.

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.