I have had the camera set on rapid fire..(ie) switch # 6 on, all others off. I will change to 15 or 30 second delay, depending on the situation. There have been times with no pictures in a week, times when the battery was dead with 300 or so pictures, and times with the 2 gig card full..700 to 880 pictures..and the battery still with a little left.
I have one on a trail and it works fine on rapid fire.