Abstract: An electronic device can include a plurality of subsystems; a primary power source; at least one backup energy storage; and a shutdown controller that detects unavailability of the primary power source. Upon detecting unavailability of the primary power source, the shutdown controller can cause one or more of the plurality of subsystems to reduce their power consumption; engage the at least one backup energy storage; initiate immediate power down of a first subset of the plurality of subsystems that does not result in data loss, data corruption, or physical system damage; and initiate sequenced power down of a second subset of the plurality of subsystems to prevent data loss or system damage, the second subset of the plurality of subsystems being powered by the at least one backup energy storage during the sequenced power down.