For sale, a sp battery isolator is used. Cosmetic looks are used with some scratches and dents. I bench tested, and it works. Yuo can conected 2  batteries together. It is 70 amps and 6 to 50 volts. It can be used on cars, boats, and sound systems on any 12 volt project to keep your batteries connected  together and charge. Take good look at the pictures. This item is for sale as is not money back or returns.  Thanks