The AA or double A batteries refer to a standard size cylindrical dry battery with dimensions of 500 mm (height) and 14.5 mm (diameter). They consist of a single electrochemical cell that may either be disposable or rechargeable.
The AA batteries capacity and terminal voltage may rely on their cell composition, but usually, they take 1.5 V. These batteries are mostly used in portable electronic devices.
There are different types of AA batteries, namely:
Zinc-Carbon: These batteries are the most affordable, but the least powerful. They only work great in low to moderate drain applications, like clocks and torches.
Alkaline: These widely available batteries give more power than Zinc-Carbon and perform better at cold temperatures.
Lithium: They work best in high drain applications, like digital cameras. They have a better double A performance than alkaline batteries.
NiMH Rechargeable: These batteries are environmentally friendly and cost-effective because you don’t need to constantly buy a new set of batteries. Their voltage is 1.2 V rather than the usual 1.5 V but they can still perform better than the alkaline batteries in a lot of applications.