Hello. this is b_assman. Few days ago i posted a thread concerning my new fender elite precision bass. Well, i just found out something i shoulve asked then. The back of my bass has a slot where u can put in a 9-volt battery. I opened it up and checked, and mine actually doesnt hav any batteries in there but the bass works fine. But out of curiousity im planning on purchasing a battery and inserting it. Can anybody who knows of this tell me how a 9-volt battery can affect the sound of my bass? Thank you.