i got batteries for a gamecube portable that im making but they are only 7.5v and someone told me that i need at least 12v for it to work so i got a voltage regulator to voltage up to 12v but i dont know how to do that! can somebody please help!

7.5 volts? What kind of batteries are you using?

sorry i meant 7.2v and these are them http://www.thesource.ca/estore/product. ... ct=W231015

...not the batteries you want.
Not enough voltage or ampherage. That will run your Gamecube for less than an hour.
I recommend 4 Li-Po cells to give you 14.8V.
(Cool people: Will that need to be regulated before going into GC's reg?)