I have the re-charable battery, the solar panel, and the wall charger. i use the wall charger to get a completely full charge on the battery and then use the solar panel to help prevent the battery from draining as quickly. The solar panel will not (at least in my experiences) keep the battery completely charged, however, it will prolong the battery life. I have my camera in some "thicker" trees and I have the solar panel pointed upward to recieve as much of the sun as it possibly can, but the solar panel doesn't see a whole lot of sun. With this setup, I still get pretty decent battery life. I went out and bought another rechargable battery so I would have two of them. I keep one charged at home and if it has been 4 or 5 weeks since I have been to my trail-cam, I then take the "fresh" battery with me and swap them out. The solar panel does help though with my Moultrie cam...