Fast Battery Drain

I have two stick up cams mounted outside the house. One camera the battery will drop to about 60-70% charge after one month. The other camera, which is newer, the battery will completely die in about 2 days. The still image capture, and video capture settings are the same on both cameras. It does not matter whether or not there is even motion activity or not. The battery drops fast and then the camera goes off line. I suspect it is a bad battery. What can I do to to fix it?