Since the Remote Controller for the Autel Evo has a charging cable with a standard USB plug, is it safe to charge the controller from a standard USB Block that plugs into a wall outlet, such as is used to charge an iPhone; and may it also be safely charged using the USB port on a power bank. I am interested in using these two alternative sources for charging my Remote Controller, rather than the standard charger supplied with the aircraft. Thanks for your help on this.