A battery connector includes an insulative housing and a plurality of contacts received in the housing. The housing defines a plurality of receiving passageways running through a front mating face to define an opening. The opening defines an upper and a lower inside face. Each contact includes an engaging portion exposing to the front face through the opening. The engaging portion intersect with the front face, defining a first joint point adjacent to the upper inside face and a second joint point adjacent to the lower inside face. The engaging portion defines a free distal end abutting against an inner face of the housing. The housing further defines a protrusion extending from the lower inside face towards the upper inside face in a condition that a distance between the second joint point and a top face of the protrusion is smaller than a length of the free distal end.