Here's a crazy idea. It freaks me out to not know exactly how strong my batteries are in my onboard active eq. Sure they last a long time, but it's a pain to test them or change them and I can't wait for them to fail during a gig to change them. Also, and perhaps this is just my imagination, new batteries sound better. How about some kind of rechargeable system, so I plug in my bass before a gig and it's fully charged for every show? OR Since leaving the cable plugged in seems to engage the battery, is it possible to design a gizmo that would plug into the bass and provide external power for emergencies? Or charge rechargeables through the jack? I gather powering thru the cord is problematic while playing and I'm wireless anyway. Thoughts?