Abstract: A battery connector assembly in accordance with the present invention has a cable end, terminal end, and sleeve. The cable end has a first connector detachably connected to an end of a cable and also has a pin having an outer surface extending out from the cable end. The terminal end has a second connector detachably connected to a battery terminal and has a post with a threaded exterior and a tubular pocket having an inner surface. The sleeve is rotatably seated on the pin and has a threaded interior. The threaded interior of the sleeve is engaged with the threaded exterior of the post so that when the sleeve is fully engaged on the post substantially the entire outer surface of the pin is engaged with substantially the entire inner surface of the tubular pocket in the post.