18650 was named after the battery size of lithium battery, lithium-ion batteries in terms of single battery, lithium battery size 18650 batteries and battery products with light body two kinds, the latter on the numerical value is greater than the former, about 18650 lithium battery size may be from the origin of it.

   Secondary battery size to naming is one of the provisions of the international electrotechnical commission (IEC), according to the IEC61960 standard, lithium secondary battery identification method is as follows: 1. The battery of identity: three letters followed by 5 Numbers cylindrical or 6 square; 2. The first letter of the battery anode materials: I said has a built-in lithium ion battery, L said lithium metal electrode or lithium alloy electrode; 3. The second letter said battery cathode material: C based on cobalt electrode, N based on nickel electrode, M manganese based electrode, V based on the electrode of vanadium; 4. The third letter said: the shape of battery R cylindrical battery, L said square cells; 5. Number: the diameter of the cylindrical battery 5 Numbers respectively and height, the diameter of the unit is mm, high degree of unit is one over ten of a millimeter, the diameter of any size or height is greater than or equal to 100 mm between the two size should add an oblique line; Square battery 6 Numbers respectively of the thickness, width and height, the unit mm, three dimension was a greater than or equal to 100 mm size should be added between the diagonal lines; If there are any less than 1 mm in three dimensions, add the letter t, before the size of this size unit for one over ten of a millimeter. For example: ICR18650: represents a cylindrical secondary lithium ion battery, the anode materials for cobalt, its diameter is about 18 mm, is about 65 mm high. There is an easy identification of part of the three writing: for example: L C 18650: lithium ion battery cylindrical battery specification to 18 m in diameter, 65.0 mm high.

   For above 18650 lithium battery size are few, the expression of various battery manufacturers, products will have some small difference, but the discrepancy is not big, namely for 18 m in diameter, 65.0 mm high design, based on the difference between general in + / - 0.2 mm in diameter, height between + / - 2.0 mm; To identify 18650 lithium-ion batteries, similar performance is the truth. Named by IEC 18650 batteries, lithium battery is actually the light body in the industry also called batteries; Practical, but also in battery assembly house there with protection board, and lead, etc., such as dongguan threats and USES 2200 mah18650 preparation of lithium batteries, electric cleaner lithium-ion battery products, its product size is 19.5 mm in diameter, height 70.0 mm. This is obviously greater than the size of batteries. Here, we will see, when mentioned the concept of "18650 lithium battery size may have two different meanings: one is 18650 lithium battery size strip, this sense of battery manufacturer mainly have sanyo, panasonic, samsung, LG, bick, etc; Another is after encapsulation of 18650 lithium battery size, the size of this sense absolutely must be 18650 lithium battery is greater than the light body size, so it is important to note that 18650 lithium battery size the concept of language environment.