A one-piece battery terminal connector having a body portion and a ferrule portion. The body portion has a top, and a bottom, and includes a first side surface, and a second, opposed side surfaces. The body portion includes, between a first and second lateral end of the body portion, an aperture for engaging a battery post. The size of the intermediate aperture is variable, permitting the connector to be placed onto, and removed from, its corresponding battery post. The connector further comprises a first upturned flange and a second upturned flange, which together cooperatively form the intermediate aperture. The first lateral end of the battery terminal connector has a generally arcuate periphery, and most preferably a semi-circular periphery. The axial or vertical spacing between the first upturned flange and the second upturned flange is approximately 0.6 times the height of the first upturned flange, or less.