A battery terminal for a terminal post of a battery includes a terminal body formed by a single plate. The terminal body has top and bottom terminal members each continuous to top and bottom tightening members. The top and bottom tightening members are provided with tapered outer surfaces. A tightening tool having upper stage tapered surfaces and lower stage tapered surfaces is place above the tightening members. When the tightening tool is pressed against the tightening members, the upper stage tapered surfaces and the lower stage tapered surfaces press said first and second tapered outer surface to compress said top and bottom terminal members to firmly hold the terminal post.