You can easily make one by cutting the ua5's wall wart power cord and the dvd battery's output cable and splicing the dvd battery connector to the ua5's power connector. Polarity is always an issue -- If I recall, the UA5's polarity is "backward" from the norm and requires splicing the red wire (positive) from one cable to the black/white (negative) wire from the other. Crucial to use a voltmeter to verify polarity before using.