An electromechanical padlock comprising: a lock body; a shackle having long and short legs (33, 31) receivable in corresponding first and second shackle openings in the lock body, the shackle being moveable in an axial direction between a retracted position and an extended position, the short leg being withdrawn from the lock body in the extended position; a locking mechanism disposed in the lock body, the locking mechanism comprising: a locking member (52, 54); a blocker having a blocking surface configured to hold the locking member in locking engagement with the shackle when the blocker is in a shackle engaging position, and further configured to allow the locking member to disengage from the shackle when the blocker is in a shackle disengaging position, to permit movement of the shackle from the retracted position to the extended position; and an electromechanical driver operable in response to an electrical authorization signal supplied to the electromechanical driver to permit movement of the blocker to the shackle disengaging position; and a battery electrically connected with the electromechanical driver to power the electromechanical driver; and a battery door assembled with the lock body to limit access to the battery; characterized in that: the blocker is movable in axial direction with respect to the lock body and the blocker further comprises a battery door latch configured to secure the battery door in a closed position when the blocker is in the shackle engaging position, and to permit movement of the battery door to an open position when the blocker is in the shackle disengaging position. a lock body; a shackle having long and short legs (33, 31) receivable in corresponding first and second shackle openings in the lock body, the shackle being moveable in an axial direction between a retracted position and an extended position, the short leg being withdrawn from the lock body in the extended position; a locking mechanism disposed in the lock body, the locking mechanism comprising: a locking member (52, 54); a blocker a locking member (52, 54); a blocker having a blocking surface configured to hold the locking member in locking engagement with the shackle when the blocker is in a shackle engaging position, and further configured to allow the locking member to disengage from the shackle when the blocker is in a shackle disengaging position, to permit movement of the shackle from the retracted position to the extended position; and an electromechanical driver operable in response to an electrical authorization signal supplied to the electromechanical driver to permit movement of the blocker to the shackle disengaging position; and a battery electrically connected with the electromechanical driver to power the electromechanical driver; and a battery door assembled with the lock body to limit access to the battery; characterized in that: the blocker is movable in axial direction with respect to the lock body and the blocker further comprises a battery door latch configured to secure the battery door in a closed position when the blocker is in the shackle engaging position, and to permit movement of the battery door to an open position when the blocker is in the shackle disengaging position.