I gained access to a decent battery charger last night and let the battery. I let it charge at 10A and when I checked on it a few hours later, it dislayed F01. I looked this up and it means "F01 Internal Shorted Cell Battery - Cannot be charged. Have battery checked by certified auto service center."
So this week, I'm going to drop that battery off at the vendor and see if they can get it working. Apparently, this is one of the first two batteries I got in Oct of 2009. It's been going bad all summer, so hopefully I can get them to replace it if need be.
On another note, I finally finished up the leftover tank of propanee from last year. Yesterday and today I've been running the propane heater quite a bit. Yesterday I ran it for over an hour during the day, and this morning I let it run for 30 minutes as it warmed the van from 25F to 50F. So a new canister is in and I have 3 remaining.