Our efficient monocrystalline solar panel is designed for charging 6v to 9v batteries. You must run a solar charge controller when using this panel. A typical panel to charge a 6v battery will have an output of about 9v with an open voltage of around 10v however this panel can put up to 12v under full direct sunlight. Under less than optimum conditions it can still produce enough voltage to charge a 6v battery. This doesn't mean it's going to maintain under full shade, it will still need sunlight to generate voltage however it will outperform standard 6v panels in the same conditions. When using to charge a 9v battery you will need full direct sun. The panel has an anodized black aluminum frame to help withstand the elements. There are screw terminals on the back in the connection box.