Use an adjustable wrench to reconnect the positive (+) cable to the positive (+) battery terminal and tighten it securely.

Use an adjustable wrench to reconnect the negative (-) cable to the negative (-) battery terminal and tighten it securely.

Double-check that all connections are secure.

Account for all of the tools you used and put them away.

Start your car to ensure it starts without any issues. Check that all electrical components, such as lights and radio, are functioning correctly.