Luckily my second battery charger was at the cottage and I didn't get out there this week-end to pick it up so I didn't try to charge the battery using the two chargers hooked up in series method. After doing some more research on this idea and reading this article
http://www.avweb.com/news/savvyaviator/191348-1.html I decided that I wouldn't risk my $400+ Gill aviation battery to a questionable charging process.
After all, I was just being lazy and trying to avoid having to take the lower cowling off the plane so that I can get the battery out and take it to my AME to be charged correctly. Its not worth risking the battery for 20-25 minutes of work.
Bill