Mainly energy storage, charging and power supply. The charging bank is a container for storing electricity. First, the external power supply is found to charge the built-in battery in advance, that is, the input electrical energy is stored in the form of chemical energy in advance. When other devices need to be powered, the battery provides energy and generates electric energy, and uses a voltage converter (DC-DC converter) to reach the required voltage. The output terminal (USB interface or Lightning interface) outputs the required device and provides power for charging other devices.
The charging bank is for consumer electronics to charge in the absence of an external power supply scenario, but because different mobile phones support different charging protocols, the charging bank also has different fast charges. Such as common PD, QC, PE and so on. In addition to mobile phones, power banks can also power tablets, smart watches, headphones, and even laptops.