The present invention concerns a power supply apparatus configured for coupling to an electronic device having a power port integral to the electronic device and a particular hardware profile. The power supply apparatus includes: a housing configured to extend the hardware profile of the electronic device in at least one dimension, a power source integral to the housing, and a power interface extending from the housing and configured to couple with the power port of the electronic device. A securing device integral to the housing is configured to couple the housing to the electronic device. Where the electronic device has a door covering its power port in a closed position and uncovering its port in an open extended position, the housing has a cover receiver for receiving the floor and maintaining the form factor of the electronic device and power supply.