What is battery 18650?

The 18650 battery is a lithium-ion rechargeable battery that is cylindrical in shape. It measures 18mm in diameter and is 65mm in length. It has a nominal voltage of 3.6-3.7 volts and is commonly used in various electronics devices, such as laptops, flashlights, and e-cigarettes. The 18650 battery has a high energy density, which means it can store a significant amount of energy in a small space. It is also known for its long cycle life, which enables it to be recharged and reused multiple times. However, it is important to note that improper handling of 18650 batteries can lead to dangers such as fire and explosion, so care should always be taken when using them.