Just got my camera built and when i power it up it flashes 4 times and then stops. Does this have something to do with the sensor warm up time, my walk/test led stays lit this whole time also. I do have a switch to control the camera or the led. Not to bright with electronics so if anyone can help, thanks alot. By the way, how long will the two AA batteries in my camera last me, and is there a way to run the camera on a bigger battery?