I bought this from Revain as a used model I think it could be a warranty work or maybe a return it has been professionally done with all Documents repackaged. ,,, it was damn easy to set up. I had some old patch cords lying around. I put the alligator clips on the other end so that I can attach it to the battery pack or another pack fairly easily. I used a small bulk charging connector as we have a lot of excess charge. ,,,,rain,,,etc. It didn't take long to load up my bench, I went ahead and fixed it to the wall. My only concern is that I won't charge my bank if it's fully charged with the plug in the back being told here there is a charging light and when it's fully charged I have to turn off all the lights in the house and see if I can can see, I didn't notice anything like that, I would turn this device on turn off with such a bulk charge with a small plug at the back ? ,,,, or I have to keep an eye on him. 20 minutes. or something and then disabled. I don't know if I did it right or not, and I haven't tried charging normally without plugging it back in. I think the normal charging will be automatic.? If anyone knows more then feel free to tell me all about it.:::::: Regards::::::::::::::Bill R.