Patent ID: 7682726

Claim:
A battery pack for locking an electrical device by thrusting the battery pack into the electrical device toward a final locking, the battery pack comprising: a locking bar ( 38 ; 40 ; 42 ) being movable and disposed in one of the electrical device and the battery pack; and at least two recesses being received in the other of the electrical device and the battery pack, the at least two recesses comprising a front recess ( 24 ) and a rear recess ( 26 ), wherein the locking bar and the two recesses are configured in a first set, a second set, and a third set, in the first set the locking bar ( 38 ) engaging successively the front recess ( 24 ) and the rear recess ( 26 ) during the thrusting, in the second set the locking bar ( 40 ) engaging only the front recess ( 24 ) during the thrusting, in the third set the locking bar ( 42 ) engaging only the rear recess ( 26 ) during the thrusting.