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1. The numbers 18650 in the 18650 lithium-ion battery represent the external dimensions: 18 refers to the battery diameter of 18.0mm, 65 refers to the battery height of 65.0mm, and 0 refers to the cylindrical battery. Common 18650 batteries are divided into lithium-ion batteries and lithium iron phosphate. The voltage distribution of 18650 batteries is between 3.2V and 3.7V. Common lithium-ion battery capacity specifications include 2200mAh, 2500mAH, 2600mAh, imported battery cells 3350mAh, and other capacity ranges.

2. The correct naming for 18650 lithium-ion batteries: The representation of cylindrical secondary lithium-ion cells is three letters plus five numbers. The first letter represents the negative electrode, I represents the lithium-ion cell, L represents the lithium-ion cell, the second letter represents the important active material of the positive electrode, C represents a cobalt electrode, N represents a nickel electrode, M represents a manganese electrode, V represents a lead electrode, and the third letter represents the shape of the cell, R represents a cylindrical cell, the first two digits after the letter represent the diameter of the cell in millimeters, and the last two digits represent ten times the height of the cell in millimeters.

For example, ICR18650 represents a cylindrical lithium-ion battery cell, with cobalt as the important positive electrode material, with a diameter of 18mm and a height of 65mm.

3. The correct use and naming of 18650 lithium-ion batteries. Under normal circumstances, the size of the cell naming number represents the maximum external size of the cell. However, some companies do not strictly follow the rules for naming, such as the 063048 model, which has an actual rear end of about 6.5 millimeters and 06 is only an approximate value.

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