Have you tried to put an ammeter between the + cable and battery terminal? You could measure parasitic draw to see if is excessive. A quick Bing search says rouhly <30mA.
Yeah. That's was one of the first things I did. It draws around 35mA. It draws 2-4 amps for about 10 minutes after you wake it up though and it looks like that is what is dragging my voltage down.
I threw in my other battery and the voltage dips pretty far on it too until everything goes to sleep. So, I don't think there's a battery/draw issue after all. That's good because I don't have to worry about getting stranded or trying to diagnose it, but it means I'm back to square one with my radio issue.