A battery powered surgical apparatus comprising: a handle including a housing； an endoscopic portion extending distally from the housing； a fastening assembly coupled to a distal end of the endoscopic portion, the fastening assembly including a pair of jaws defining a stapling mechanism, at least one of the jaws being movable with respect to the other jaw； a drive source proximal of the endoscopic portion, the drive source including a motor powered by a battery and connected to a drive shaft； and a gear assembly engaged with the drive shaft of the motor, the gear assembly disposed within the housing and including a main gear operatively connected with a driving member, the motor being adapted and configured to spin the main gear such that rotary motion of the main gear moves the driving member linearly in an axial direction within the housing to impart an axial force on a corresponding member in the endoscopic portion to engage and actuate the stapling mechanism in the fastening assembly.
