Charging Speed: Information about the power bank's charging speed, often measured in watts or Amps. A 15W power bank should support relatively fast charging. Capacity: The capacity of the power bank, measured in mAh (milliampere-hours), indicates how much energy it can store. Higher capacity allows for more charges or longer device usage. Ports: Check the types and number of ports available. USB-A and USB-C ports are common, and some power banks may support fast charging technologies. Compatibility: Ensure that the power bank is compatible with your devices, considering both the charging cable and the charging protocol. Build Quality: Consider the build quality and materials used in the construction of the power bank. Safety Features: Look for features like over-current protection, over-voltage protection, and temperature control to ensure safe charging.