Power Bank - energy storage. The main function is to store a certain amount of energy previously obtained from the network, to charge partially or fully discharged electronic devices for further transfer using a standard USB cable.
In other words, Power Bank is a class of universal mobile chargers. Versatility is related to compatibility with all standard digital products using the USB interface for charging. Mobility means that a previously charged Power Bank can charge any compatible device without using the network. At the same time, the size makes it convenient to carry a compact Power Bank (in a pocket, bag, backpack).
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