Power Bank is a portable charger that can be carried by individuals and can store electrical energy. It is mainly used to charge consumer electronic products such as handheld mobile devices (such as wireless phones and laptops). It is especially used in situations where there is no external power supply. Its main components include: a battery used for energy storage, a circuit (DC-DC converter) that stabilizes the output voltage, and most mobile power supplies have a charger for charging the built-in battery.
