Use only a powerbank that is intended for the purpose, such as the one that comes with HETA Quad. Some types of powerbanks have built-in parts that detect the data signals on the plug and since these are not used on this installation, this type of powerbank cannot be used, because it will typically go into standby after 1-5 min. If you want to be on the safe side with the type, a new original HETA powerbank can be ordered at www.heta.dk. Use the included usb cable for charging the HETA powerbank.