I'll go out on a limb and say you'll run out of memory before you'll run out of battery. The cam uses very little power and it's looking like I'll get 4000 pics plus on my first set of batteries. I'm at 2500 pics and 180 vids now and still going. I've got it set up now overlooking corn and a moultrie. i'm gonna take 1 min vids every 7 minutes. That long time with the ir illuminated should really test the batteries.