I think the battery in the Clown Shoe is shot. I charged it fully a couple weeks ago, then left it disconnected (guaranteed no load) and it was dead yesterday. So then I charged it again, it started the car once and now it's back to 10.5 volts.
Looks like I get to jump start the car in a few days when it's time to move it to the new house. I'm glad it's only a 4 mile move.