History #

The 18650 battery size was first introduced in the early 1990s. It was developed by Sony for use in the company’s camcorders and laptop computers. The 18650 battery size is based on the standard 18mm x 65mm size of a cylindrical battery. It was designed to provide a higher energy density than other battery sizes, making it a popular choice for a wide range of applications.

Typical Chemistry #

The 18650 battery size typically uses lithium-ion (Li-ion) chemistry. Li-ion batteries are known for their high energy density and low self-discharge rate. They are also lightweight and have a long cycle life, making them an ideal choice for portable electronics. Other chemistries, such as nickel-cadmium (NiCd) and nickel-metal hydride (NiMH), can also be used in 18650 batteries, but Li-ion is the most common.

Typical Use #

The 18650 battery size is used in a wide range of applications, from consumer electronics to medical devices. They are commonly found in laptop computers, digital cameras, and portable media players. They are also used in electric vehicles, such as electric bicycles and scooters, as well as in power tools and medical devices.

Design #

The 18650 battery size is designed to provide a high energy density and long cycle life. The cells are made up of several layers of electrodes, separators, and electrolytes, which are all housed in a cylindrical metal casing. The casing is typically made of steel or aluminum, and it is sealed with a plastic or rubber cap. The cells are also equipped with a safety vent that releases pressure in the event of an overcharge or overdischarge. This prevents the cells from becoming damaged due to excessive heat or pressure.

The cells are also equipped with a positive and negative terminal, which allows them to be connected in series or parallel configurations. This allows for a wide range of voltage and current combinations, making it possible to customize the battery for specific applications. The cells are also available in a variety of capacities, ranging from 1000mAh to 3500mAh.