Engine Starts Hard

I have a 2000 Nissan Xterra. It has the 6 cylinder eng., auto trans, and a/c. My problem is when I turn the ignition key, the car barely starts...like the battery is going to die (Note that the battery is only a yr old). Once the car starts, it runs normal, like nothing is wrong. The car actually did not start a couple of times, but when I waited about 2-3 minutes and tried again, it would start, but barely. Any help would be greatly appreciated. Thank you! James