Disclosed embodiments include an access terminal including a controller, an interface and a power manager. The interface can be connected to an external adapter and/or an external mobile power supply. The power manager can be connected to the interface and the controller, and can be configured to manage power supplied to the access terminal. The controller can be configured to, when confirming that the interface is not connected to the external adapter and is connected to the external mobile power supply, control the external mobile power supply to power the access terminal through the power manager.