There are three main types of mainstream lithium batteries, namely cylindrical, square and soft.

　　Among them, cylindrical lithium batteries have a long history and are the most common form of lithium batteries.

　　There are many types of cylindrical lithium batteries, such as 10440, 14500, 18500, 18650, 21700, 26650, 32650 and so on.

　　10440 battery cell

　　This lithium battery has a diameter of 10mm and a height of 44mm. This is the same size as the "No. 7 battery" of disposable dry batteries and the AAA battery of Ni-MH batteries. The capacity is generally only 200 mAh. It is mainly used in mini electronic products and flashlights. , Audio, loudspeaker, etc.

　　14500 battery cell

　　This lithium battery has a diameter of 14mm and a height of 50mm. This is the same size as the "No. 5 battery" of disposable dry batteries and AA type batteries of Ni-MH batteries. The capacity is generally 500 to 1,000 mAh. It is mainly used in wireless audio. , Electric toys, digital cameras, etc.

　　18500 battery cell

　　This lithium battery has a diameter of 18mm and a height of 50mm. This is the same size as the A-type nickel-hydrogen battery. The capacity is generally only more than 1,000 mAh. It is mainly used in consumer electronics, wireless audio, electric toys, digital cameras, and lasers. Lamps, lighting fixtures, etc.

　　18650 battery cell

　　This lithium battery has a diameter of 18mm and a height of 50mm. This is the most common and mature model in the market, with a capacity from 2000 to 3000mah. It has a very high cost performance and good quality stability. It is widely used in small appliances such as mobile phones, notebook computers, power tools, and vacuum cleaners.

　　21700 battery cell

　　This lithium battery has a diameter of 18mm and a height of 50mm. The single capacity is very high, up to 5000mah. It is very suitable for applications with high energy density requirements, such as digital products, electric vehicles, balance vehicles, solar street lights, LEDs Lamps, power tools, etc.

　　Cylindrical lithium batteries are the mainstream in the current market, and they will not be eliminated in the future.

　　Lithium-ion battery (LIB) has become the main energy storage solution in modern social life. Among them, lithium iron phosphate battery is a perfect replacement for lead-acid batteries, and it is the first choice for grid-connected peak shaving, off-grid energy storage, photovoltaic energy storage, UPS, data center and other industries.