My brother is looking at getting a schecter stilitto five string fretless he found on ebay. http://www.ebay.com/itm/Schecter-St...e-/140826093154?pt=Guitar&hash=item20c9e3a662 According to the pics it has double battery holder for two batteries. Can it run on single 9 volt battery like every other emghz with 3band eq that Ive seen etc? Or is two batteries required? If yes, why? Thank you. Btw. if single battery use requires change to battery wiring, is it easy to do?