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Portable power banks are compact and transportable devices designed to charge electronic devices such as cell phones, tablets, and other portable electronics when access to an electrical outlet is unavailable or inconvenient. These power banks store energy in built-in rechargeable batteries, allowing users to charge their devices on-the-go. They come in various capacities, ranging from small ones with a few thousand milliampere hours (mAh) to larger ones with tens of thousands of mAh. The higher the capacity, the more charges it can provide before needing to be recharged itself. Some portable power banks also feature multiple USB ports, enabling users to charge multiple devices simultaneously. Additionally, some models are equipped with built-in cables or support for wireless charging, providing added convenience and versatility. Overall, portable power banks offer a reliable and convenient solution for keeping electronic devices powered while on the move.