September 3, 2017 Share 0 Tweet Share 0 Size The biggest difference between AA and AAA batteries is their size. The battery designations indicate potential charge and size of batteries. When it comes to size, it’s important to note that AA batteries are bigger than AAA batteries. Some devices operating on batteries use only one particular size, so it’s important to note the size difference. At most, you won’t be able to use an AA battery on an AAA battery slot, but you can sometimes use an AAA battery on an AA slot. Luckily, there are adapters that make this possible most of the time. Voltage Both AAA and AA batteries have the same voltage, same as some bigger batteries such as the D type. The reason for this is because they’re all mostly just a single cell. For example, the smaller AAA battery has less electrochemical material that contains the electric charge. However, there are also high capacity AAA batteries that can easily surpass the ability of an AA battery. If you’re looking into an EDC carry flashlight, then you can get either AA or AAA. Looking into EDC Flashlights? Read my top choices on every day carries Which One is Better? The use of both of these battery types depends on many different factors. There are no rules or standards that decide when to use one or the other battery type. However, you’re probably going to notice AA batteries in many devices that consume a lot of power. Small electric torches and battery operated toys are some of the tools that you’d find an AA battery in. Also, they use more than one AA cell to increase the operating time and voltage. Portable and low power devices usually use the AAA batteries. The remote control is a good example of a device that uses an AAA battery. We’ve all noticed how remote control doesn’t require an often battery change. Same goes with clocks, too, as they don’t consume too much power either. When it comes to rechargeable batteries, you’d need a charger for them. Mostly, a charger that’s suited primarily for your batteries is what you’re looking for. Still, some charges fit both AA and AAA batteries, which is always convenient. They operate with a spring that pushes the battery into place. You can use one charger for both types simply because AAA and AA batteries have the same electrical specifications. Final Thoughts In conclusion, AA batteries are bigger than AAA, while AAA batteries have a smaller amount of material. You don’t have to charge the AAA as often, and you can find them in low power devices. AA batteries are for devices that use more power.