The product structure of mobile power is relatively simple, mainly composed of three parts: storage medium, circuit board and shell. Among them, there are two types of storage media: polymer batteries and lithium batteries. At present, most mobile power supplies use lithium batteries, and among them, 18650 batteries dominate. The output voltage of a single 18650 cell is between 2.7-4.2V and the capacity is 2600m Ah. In order to increase the storage capacity of the mobile power supply, the method of connecting multiple battery cells in parallel is usually used, so the nominal capacity of the mobile power supply is generally a multiple of 2600mAh
