What is the voltage of a AAA alkaline battery?

The nominal voltage of an AAA alkaline battery is 1.5 volts. “Nominal” means the standard rated value used to describe the cell, not that its voltage remains exactly 1.5 volts at every moment.

A fresh alkaline AAA battery can initially measure around 1.6 volts with no load. As the battery powers a device, its voltage gradually falls, and the exact reading depends on the device’s current demand, battery condition, temperature, and measurement method.

AAA describes the battery’s physical size, while alkaline describes its chemistry. The IEC designation for an alkaline AAA cell is LR03. Other AAA-sized cells can have different nominal voltages: nickel-metal hydride rechargeable cells are typically 1.2 volts, while some lithium-ion products are around 3.7 volts and may not be safe replacements unless the device specifically supports them.

AAA batteries are smaller than AA batteries and are widely used in remote controls, clocks, small flashlights, and other compact electronics. Several cells can be connected in series to increase the total voltage.