The present invention discloses methods and systems for managing power supply at a device. The device is capable of receiving power via a plurality of power inputs. The device first determines whether or not a first condition is satisfied. A first switch is maintained in a closed position if the first condition is satisfied. When the first switch is in a closed position, the device is capable of receiving power from a first power supply. Alternatively, when the first condition is not satisfied, the device determines whether or not a second condition is satisfied. If the second condition is satisfied, the first switch is maintained to be in a closed position. If the second condition is not satisfied, the first switch is opened after a predefined time period.