Belt clip attachment device and method of use

A device attachment system comprising:

• an electronic device comprising a housing having a rear face and a detachable battery door disposed on said rear face, the detachable battery door comprising:
• a cylindrical recess having a recess diameter and an inside cylindrical wall, wherein a first section of the cylindrical recess is in the detachable battery door and a second section of the cylindrical recess is in the rear face of housing;
• and
• at least one lateral peg projecting outward from the inside cylindrical wall;
• a detachable knob having a knob diameter less that the recess diameter such that the detachable knob seats within the cylindrical recess, the detachable knob comprising:
• a locking track adjacent to a first end of the detachable knob, the locking track for engaging the at least one lateral peg when the detachable knob is partially rotated within the cylindrical recess;
• and
• a knob connection portion at a second end of the detachable knob;
• and
• a belt clip having a clip recess for accepting the knob connection portion of the detachable knob.

A mobile phone for attachment to a belt clip, the mobile phone comprising,

• a housing having a back face, the back face comprising a battery recess;
• a removable battery seated in the battery recess, the removable battery forming a portion of the back face of the housing;
• a cylindrical recess formed into a first portion of the removable battery and a second portion of the back face adjacent to the removable battery, the cylindrical recess comprising an interior cylindrical wall with at least one peg projecting out from the interior cylindrical wall;
• and
• a removable universal clip seated in the cylindrical recess, the removable universal clip having a first end comprising a locking track for engaging the at least one peg to lock the removable universal clip in to the cylindrical recess, the removable universal clip having a second end for attachment to the belt clip.