21700 Small Battery LED Display Function PB80 Portable Power Bank

Power bank

It is a portable charger that can be carried with you, can store electrical energy by itself, and is mainly used to charge consumer electronic products (such as wireless phones, laptops) such as handheld mobile devices. It is especially used in the absence of external power supply occasion. Its main components include: a battery used for electrical energy storage, a circuit for stabilizing outputvoltage (DC-DC converter), and a charger circuit for charging the built-in battery. There are very few mobile power sources without a charging circuit, but they are almost extinct.

The emergence of mobile power sources stems from the emergence of smart phones, which are much more powerful than their previous similar products. Frequent use by users has caused a rapid increase in power consumption, especially the first iPhone with a built-in battery design that cannot be replaced by users, and the battery is exhausted It is not possible to replace another fully charged

battery immediately. After the battery is exhausted, you must continue to use the iPhone that you carry with you. Using a mobile power source is the only way so far. Later, it is also commonly used as other handheld mobile devices to charge when there is no external power supply, but because its output interface is a highly versatile USB interface, it can also be used as other devices or devices that use USB interface as a power input terminal. Power supply, such as USB LED lights, USB electric fans, etc.