This simple cable has so many uses! Plug the 9 volt battery clip onto a standard 9V battery and connect the other end to anything with a 5.5x2.1mm, center-positive barrel jack.
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Great little adapter. I use them to supply power to breadboard power supplies (https://www.sparkfun.com/products/114) from anything with a 9V battery style clip. A couple of 4-D cell battery holders wired together plus one of these adapters gives me plenty of portable 12V power for my breadboard projects and any other devices I have that require 9-12 V.