I have to say covert as well. I have 3 mp8's 16 hours from home. I go there once a year to hunt, that's when I check them. Last year I was shocked when all 3 were still running.
One had 8 lithium AA's and had taken over 7,000 pictures, battery level full 5 bars!
The next cam I had 8 Alkaline AA's in it. It took 5,400 pics sd card was maxed out and I had it set to not over write. Battery level one bar left.
The last one had only 4 lithium AA's, had over 5,000 pics and took one of me when I opened it up. Battery level still 4 out of 5 bars! Just unbelievable service!