Abstract: A battery connection comprises a battery post protruding from a battery and a battery cable terminal for clamping connection with the battery post. The battery post is an elliptical cylinder projecting perpendicularly from the surface of the battery, and the battery cable terminal has a mating elliptical clamping ring. When the clamping ring is fitted over the post and tightened therearound, the elliptical shapes of the post and terminal substantially prevent twisting of the terminal relative to the post and so inhibit loosening of the terminal. The smoothly curved, cornerless elliptical shape of the post allows the ring to slide around the perimeter of the post as the ring is tightened so that the normal contact force between the ring and the post is substantially constant around the perimeter thereof.