Disclosed herein is a dynamic backup battery for updating the firmware of a media device. The media device includes a memory device that is electrically coupled to a port. The port of the media device is configured to receive a first power. The media device also includes a battery that is electrically coupled to the port and is configured to supply a second power to the port. The media device includes a processor electrically coupled to the battery and is configured to monitor the power level of the first power received and based on the power level of the first power received falling below a threshold value, the battery supplies a second power to the port of the media device. The processor is further configured to activate a low power mode, detect an event while in low power mode, deactivate low power mode, perform a task, and reactivate low power mode.