[Mavrick14]

Not a huge deal, depending on the style of battery terminal end. If its side post then you can replace just the bolts, so go ahead and reef them off (use a 6point wrench of socket, otherwise it may strip the head of the bolt). If its top post with a bolt through it, just break the bolt and replace. If you have enough slack on the cable, you can snip the terminal ends off and replace them as well. Make sure to use some sory of battery dressing (silicone grease works) when your done to prevent another corrosion mess.

Your jump starting issues im sure are due to a completely dead battery. The clicking you hear is your starter solenoid, not getting enough power to get the starter going.