Uh... Mako, some pocket tvs run off of 4 or 6 AA batteries, which can be either 6v or 9v, depending.
Dako, unless you are tight on money or already have this type of screen on hand, I would suggest buying another LCD. There are some decent LCDs for about $30 shipped on ebay that are very portable friendly.
EDIT: Nice, 666th post. Let's see how long I can wait till I break it.