Capacity: Check the power bank's capacity, usually measured in milliampere-hours (mAh) or watt-hours (Wh). Higher capacity means more charging cycles for your devices. Output Power: Look for information on the power bank's output specifications, especially if it supports fast charging technologies such as Quick Charge, Power Delivery, or other proprietary standards. Input Power: Verify the input power specifications, as this determines how quickly the power bank itself can be recharged. Ports: Check the types and number of ports available on the power bank. USB-A and USB-C ports are common, and some power banks may have multiple ports. Design and Build: Consider the physical design, build quality, and materials used in the construction of the power bank. Additional Features: Some power banks come with extra features such as LED indicators, wireless charging capabilities, or pass-through charging. Charging Cable: Check if the power bank includes the necessary charging cables or if you need to use your own.