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Power bank with digital charging state display
A power bank is a portable device that can supply power from its built-in battery, typically through a USB port.

Power banks have various sizes and typically contain 18650 battery cells. The smallest power banks have a single cell. Moderately sized ones for mobile phones usually have few cells in a parallel circuit, and large ones additionally in two series.

Power banks are popular for charging smaller battery-powered devices with USB ports such as mobile phones and tablet computers and can be used as a power supply for various USB-powered accessories such as lights, small fans and external digital camera battery chargers. They usually recharge with a USB power supply. More recent power banks use USB-C and may feature an additional USB-B micro port for backwards compatibility.

The power bank includes a control circuit that both regulates charging of the battery and converts the battery voltage to 5.0 volts for the USB port.[citation needed] Power banks may be able to detect a connection and power on automatically. If the current load is under a model-specific threshold for a specific duration, a power bank may power down automatically.[17]

Charging state is typically indicated through four LED lamps for each quartal, whereas some higher-end models feature an exact percentage display.[18][19]

Some power banks are able to deliver power wirelessly, some are equipped with an LED flashlight for casual near-distance illumination when necessary, and some have a pass-through charging feature which allows providing power through their USB ports while being charged themselves simultaneously.[20]

Some larger power banks have DC connector (or barrel connector) for higher power demands such as laptop computers.

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