Power Bank - energy storage. The main function is the storage of a certain amount, previously received from the network, of electric charge for further transfer of its partially or fully discharged electronic device, using standard USB cable.
In other words, Power Bank is a class of universal mobile chargers. The versatility is due to compatibility with all standard digital products using a USB interface for charging. Mobility means that the pre-charged Power Bank is able to charge any compatible device without resorting to the network. At the same time, dimensions make it easy to carry compact Power Bank with you (in your pocket, purse, backpack).
