This morning, I found my TCH unresponsive after being parked for about a week. I had left my Garmin Nuvi plugged into the cigarette lighter so that may have contributed to the problem. I hopped into my old car which I still haven't gotten around to selling yet and got groceries after stopping by Sears and buying a $30 battery charger/maintainer. It's not a rapid charger but a rapid charger or jump starting was exactly what I wanted to avoid.

A voltmeter indicated my battery was at 5V before I started charging. Three hours later, it was at 11V and I disconnected the charger and was able to start the car.