Due to the improvement of modern battery production technology, the specifications and dimensions of lithium ion batteries will be different for different manufacturers or the same manufacturer because of the specific actual use of batteries, and some parameters will be different, such as size, shape, etc. There are more customized battery specifications.

AAA, AA, C, D, N, F, SC and other identifications seen on the battery body are all American model identifications. In China, except for several names by number, other names are American. In addition, five digit (cylindrical) or six digit (square) models, such as 14500 and 103450, are used to represent the model of the secondary lithium ion battery. See the battery model for details. The models of common batteries are generally divided into: 1, 2, 3, 5 and 7, of which 5 and 7 are particularly common. The so-called AA battery is No. 5 battery, while AAA battery is No. 7 battery.

Model designation of square lithium-ion battery: 6 numbers represent the thickness, width and height of the battery, in mm. If any of the three dimensions is greater than or equal to 100mm, a diagonal line shall be added between the dimensions; If any of the three dimensions is less than 1mm, the letter t "shall be added before this dimension, and the unit of this dimension is one tenth of a millimeter.

The model designation of the cylindrical lithium ion battery is composed of three letters and five digits. Three letters, I, indicate the built-in lithium ion, and L, indicate the lithium metal or lithium alloy electrode. The second letter represents the positive material, C represents drill, N represents nickel, M represents manganese, and V represents vanadium. The third letter, R, represents a cylinder. Five numbers, the first two numbers refer to the diameter, and the last three numbers refer to the height, all in mm.

One of the important performance indicators of battery performance is battery capacity. The capacity of lithium ion battery is related to the weight of materials. Because the weight is large, there are more substances that can participate in chemical changes, and the electric energy is large. In the actual production of single lithium-ion batteries, there is a volume limit, so multiple single lithium-ion batteries should be combined to form their own capacity.