Where can I get a 12v plug and cord, with alligator clips, long enough to reach the battery terminals from the rear trunk 12v outlet on my 2013RT? I park the spyder in a shed with no power to it, so I thought I would try to maintain the battery using the rear plug. I checked at Walmart and a few auto stores here in town but no luck. I also have the Battery Tender Junior clips, with the male/female connector plug I could use if there is a cord with a matching connector.