How to Replace a 1999 Audi A4 Battery

1. Open the hood of the Audi A4.
2. Unsnap the black battery cover to expose the battery.
3. Loosen the negative battery cable, using the 10-mm wrench, and pull the cable off of the battery terminal. The negative battery terminal has a '-' symbol next to it.
4. Remove the positive battery cable by loosening the nut with the 10-mm wrench, and pull it off of the terminal. The positive battery cable has a '+' symbol next to it.
5. Unscrew the retaining bolt at the bottom of the battery holder and lift out the battery.
6. Place the replacement battery in the holder and tighten the retaining bolt.
7. Attach the positive battery cable to the positive battery terminal and tighten it with the 10-mm wrench.
8. Slide the negative battery cable onto the negative battery terminal and tighten the cable with the 10-mm wrench.
9. Close the battery cover by snapping it into place.