Is an 18650 Battery the Same as 3 AAA Batteries?

When comparing an 18650 battery to three AAA batteries, there are significant differences in terms of voltage, capacity, size, and applications.


18650 Battery

An 18650 battery is a type of Lithium-ion (Li-ion) rechargeable battery. Key characteristics include:

  • Voltage: 3.7V
  • Capacity: 1800mAh to 3500mAh
  • Size: 18mm in diameter, 65mm in length
  • Usage: High-drain devices like laptops, power tools, and electric vehicles


AAA Batteries

AAA batteries are commonly found in household devices and come in various chemistries, such as Alkaline and NiMH. Key characteristics include:

  • Voltage: 1.5V (Alkaline), 1.2V (NiMH)
  • Capacity: 600mAh (NiMH) to 1250mAh (Alkaline)
  • Size: 10.5mm in diameter, 44.5mm in length
  • Usage: Low-drain devices like remote controls and clocks



  • Voltage: Three AAA batteries in series can provide 3.6V (NiMH) or 4.5V (Alkaline), close to the 3.7V of an 18650 battery.
  • Capacity: An 18650 battery generally has a higher capacity than three AAA batteries combined.
  • Size and Form Factor: An 18650 battery is larger and bulkier, not interchangeable with three AAA batteries in most devices.



An 18650 battery is not the same as three AAA batteries. While they can provide similar voltage, the 18650 battery offers higher capacity and is used in high-drain applications, whereas AAA batteries are better suited for low-drain devices.

Post time: May-12-2024