I own a portable battery pack/speaker from RadioShack that is orange and looks like a twisted, rounded rectangular prism (if details like that help). It used to be charged through a cable that had a 3.5mm jack at one end and a USB plug at the other, but I lost the cord. Is it possible to splice two new cords of those types together to make another cord; or was that one completely unique, making buying a new one my only option? Any help would be appreciated. P.S. I do have a soldering iron and electrical tape on hand, but not any shrink tubing.