The present invention discloses devices and methods for advertising during fast-charging of mobile devices. Methods include the steps of: upon engagement of a mobile device with a fast-charging advertising (FCA) device, operationally connecting with the mobile device in order to determine whether the mobile device is enabled for fast-charging; interfacing with a fast-charging module configured to provide fast-charging capability to an enabled mobile device; and upon determining the mobile device is enabled for fast-charging, activating an FCA capability, wherein the FCA capability includes: providing at least one billing option for a billing selection; offering at least one advertising option for an advertising selection; and upon acceptance of the billing selection and the advertising selection: initiating fast-charging of the mobile device via the fast-charging module; and broadcasting an ad during the fast-charging. Preferably, the FCA device is embodied in an FCA card.