Does anyone else have one? I got mine as a gift - great little bass - except - it requires a 9V battery to run an optional chorus effect. However - it needs the 9V - even if you aren't using the built in effect. Well no problem you might be thinking, right? Problem is - it doesn't like any old 9V - it likes 7 year smoke dectector lithiums. I have no idea how long the battery stays good for either, makes me very hesitant to play it. Anyone else having this problem?