My friend has a 2000 Mustang V6, 5 speed. It had some hesitation starting a few times. But came to a light and went to put it in gear and it cut off. Lights and everything turns on but it gives a click but won't start. Could it be the starter? We charged the battery at the auto store, but wondering if the battery could be that bad that it's not strong enough to start the car...Please Help me. Thanks