In an electric padlock, a lock casing is formed with first and second shackle insert holes. A shackle member has a longer leg portion that is movably disposed in the second shackle insert hole and that is biased upwardly. A latch member is received in the lock casing, and is movable between locking and unlocking positions for engaging and disengaging a shackle groove in a shorter leg portion of the shackle member. An electric operating unit includes a drive motor mounted in the lock casing and engaging the latch member. The drive motor is operable for moving the latch member from the locking position to the unlocking position. A remote controller is operable so as to provide an electric signal to the drive motor for controlling operation of the drive motor.