With the engine off, pop the hood and find the battery. Detach the negative (black) battery cable from the battery. First loosen the nut with a combination wrench. A better tool to use would be battery pliers or a battery wrench.
2
Twist and pull up on the end of the cable with your hand. If it does not come off easily you may want to purchase a battery terminal puller from your local auto parts store. This will help prevent damage to your battery or cables. It is not recommended to use a screwdriver as a pry-bar, this could break off your battery terminal or cause other damage.