18650 rechargeable battery lithium 3.7v 3500mah.Cylindrical lithium-ion battery specifications

　　①10440 battery

　　The 10440 battery is a lithium battery with a diameter of 10mm and a height of 44mm, which is the same as the size of the "No. 7 battery", and the battery capacity is generally very small, only a few hundred mAh, mainly used in mini electronic products. Such as flashlights, mini speakers, loudspeakers, etc.

　　②14500 battery

　　14500 battery is a diameter of 14mm, height of 50mm lithium battery, this battery is generally 3.7V or 3.2V, nominal capacity is relatively small, larger than 10440 battery, generally 1600mAh, discharge performance is superior, the most important application field is consumer electronics, such as wireless audio, electric toys, digital cameras and so on.

　　③16340 battery

　　16340 battery is a diameter of 16mm, the height of 34mm lithium battery, this battery because the height is a little lower, and the capacity is not very small, so in the strong flashlight, LED flashlight, headlamp, laser light, lighting fixtures and so on often appear.

　　④18650 battery

　　18650 battery is a diameter of 18mm, the height of 65mm lithium battery, its biggest feature is that it has a very high energy density, almost 170 watt hours/kg, so this battery is a cost-effective battery, we usually often see most of this battery, because it is a relatively mature lithium battery, all aspects of the system quality stability is better, It is widely used in occasions with a battery capacity of about 10 KWH, such as on small electrical appliances such as mobile phones and laptops.

　　⑤21700 battery

　　The 21700 battery is a lithium battery with a diameter of 21mm and a height of 70mm, because its volume increases, the space utilization rate increases, the energy density of the cell and the system can be improved, and its volume energy density is much higher than that of the 18650 battery, which is widely used in digital. Electric vehicles, balance vehicles, solar energy lithium battery street lights, LED lights, power tools, etc.

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