i got two brand new 9volt batteries for the actice electronics on my status bass guitar. i charged the 9 volt batteries completely and put them in my bass. however i did not plug the bass into an amp for one month. No it seems the batteries are discharged. So my question is, when do the batteries on active bass discharge? When putting them in the bass? Or just when turning up the volume or just when i activate the active pickups? Or something else?