A power bank is a portable battery device designed to charge electronic gadgets such as smartphones, tablets, laptops, and cameras when you are away from traditional power sources. It stores electrical energy internally, typically in lithium-ion or lithium-polymer batteries, which can then be used to recharge your devices on the go by connecting them via USB cables or, in some models, wirelessly
. Power banks vary in size and capacity, measured in milliamp-hours (mAh), which indicates how much charge they can hold and how many times they can recharge your device. They often include multiple USB ports to charge several devices simultaneously and may feature fast-charging technology to speed up the process. They are especially useful during travel, outdoor activities, or any situation where access to a power outlet is limited
. To use a power bank, you first charge it by plugging it into a power source. Once charged, you can connect your device to the power bank, which then transfers the stored energy to your device, allowing you to continue using it without interruption
. In summary, a power bank is a convenient, portable charger that provides a reliable power source for your electronic devices anytime and anywhere, helping you avoid running out of battery when away from traditional charging options
