Power banks are portable charging devices that can charge smartphones or any device with a USB port, including Bluetooth speakers and headphones [What Are The Power Bank Specifications You Need To Know? - Moglix](https: //www.moglix.com/articles/what-are-the-power-bank-specifications-you-need-to-know). They are becoming essential for keeping devices powered on the go, especially when your battery is low [What to know before buying a power bank - CHOICE](https: //www.choice.com.au/electronics-and-technology/phones/mobile-phones/buying-guides/power-banks). Some power banks have specific settings for certain devices, such as Huawei smartphones [Specification of Anker Power Bank (25K, 165W, Built-In and ...](https: //support.anker.com/s/article/Specification-of-Anker-Power-Bank-25K-165W-Built-In-and-Retractable-Cables).

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