How do you replace battery in a 2004 Mazda 3?

To replace the battery in a 2004 Mazda 3, first, ensure the vehicle is turned off and parked on a flat surface. Open the hood and locate the battery; disconnect the negative terminal (black) first, followed by the positive terminal (red). Remove any brackets or clips holding the battery in place, then lift the old battery out and place the new one in, connecting the positive terminal first, followed by the negative terminal. Finally, secure any brackets and close the hood.