What battery should i use for the pc fan mod? Should i use a 7.2v, 8.4v, 9.6v, or 12v? I really want to use something like this. I have a few lying around, easy to carry on the trail, easy to mount, recharchable, etc, etc. http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXWZB8&P=0 Thanks guys.