OK, Let me clear things up a bit. I got the guitar home last night, plugged it in and it lasted about 5-minutes then went dead. The battery was dead. I opened the battery cover and after removing the shim, got the battery out. Of course, duh, the battery is supposed to be loose when the cover is open. The cover , when closed, applies pressure to the battery and holds it tight against the spring contacts. So the shim is not required. (Good, because it made it really difficult to remove the battery). I don't think a loose battery was ever the cause, and when he tapped on the back of the neck, it wasn't even plugged in yet so the dead battery wasn't the cause of the buzz/rattle. I think the truss rod was actually loose, causing the fret buzz and probably even the rattling. So having him adjust the truss rod fixed those issues. He also sanded the bridge and now I have sound for all strings, although the high E string is still not as powerful, but I'll pass that off to me using light gauge strings. Overall the guitar is back to normal and I learned a little more about the acoustic/electric system. The battery was over three years old, with very minimal use, but still over 3-years old.