OK, so on the Sire the battery is part of the circuit. Even if the battery is drained it can still complete the circuit, but if you removed the battery it would not work. On my Fender Jazz Plus the battery is not part of the circuit when the selector switch is in passive setting. As I said, I don't even have a battery installed on that bass. On my Ibanez SR1350B the battery is not part of the circuit when the pre-amp is switched off, so the bass works without a battery installed, or so I am told, I have not tested that myself.Well, I'm no electrian, so I can't tell the details but see here and the following posts:
Post in thread 'Sire Bass Club!'
I tend to forget to unplug my bass and my main bass (to this point) has EMGs and no passive switch. So I have spend quite a bit more on 9V batteries than I should. When I flip the switch to passive mode on my V7, does that mean there is no drain on the battery? Can I leave it plugged in?
Nope, you have to unplug to prevent battery drainage; I confirmed with Sire.
As I said, some basses include the battery in the circuit, some do not. Easy to test, just remove the battery and see if the bass still works.
I have a Sire, but it is a P5R and is totally passive.
But I still unplug anyway, for reasons already stated.
