What is a 18650 battery?

A 18650 battery is a type of rechargeable lithium-ion battery. The name “18650” refers to its dimensions: it is 18mm in diameter and 65.0mm in length. These batteries are commonly used in portable electronic devices such as laptops, flashlights, electric vehicles, and many other applications where a reliable and rechargeable power source is needed. The 18650 battery is known for its high energy density, long lifespan, and ability to deliver consistent power output, which makes it popular in both consumer electronics and industrial settings.