An AA battery is composed of a single electrochemical cell that may be either a primary battery (disposable) or a rechargeable battery. The exact terminal voltage and capacity of an AA size battery depends on cell chemistry. An AA battery—also called a double A or Mignon (French for “dainty”) battery—is a standard size single cell cylindrical dry battery. The IEC system calls it size R6, and ANSI calls it size 15.

AA battery

Battery (Nominal) Voltage

A battery’s chemistry will also affect the nominal voltage that it will produce. For example, an alkaline battery, like a AA or AAA, has a nominal voltage of about 1.5V, while the voltage of a LiPo battery will usually be around 3.7V. The key word here is ‘nominal’, as the actual voltage of the battery will fluctuate depending on how much charge it has left. A fully charged LiPo battery will produce about 4.23V, while when discharged its voltage may be closer to 2.7V. Different types of battery size with nominal voltage are shown below:

ChemistryBattery SizeBattery (Nominal) VoltageRechargeable?
Alkaline or Zinc-carbonAA, AAA, C, and D1.5VNo
Alkaline or Zinc-carbon9V9VNo
Li-MnO2Coin Cell3VNo
Li-ion, Li-polyVarious sizes3.7VYes
Li-polyVarious sizes3.7VYes
NiMH or NiCdAA, AAA, C, D1.2VYes
Six-cell lead-acidCar battery12.6VYes

 

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