Sorry for the lateness, but I just saw your question on the post about the battery acid eating the bike away.  The battery has been GREAT.  The exact batteries I purchased are POWERTRON PT1212 12V 12Ah.  They only have a small tab for each post, so I had to solder some wire to each post and then attach a connector to the end of each wire.  That way, the original battery cable ends on the bike could still be used in case of an emergency where I HAVE to purchase a new battery from, lets say, Wal-Mart.  It hasn't given me any trouble at all, and I don't expect it to for a while.  It has been on the bike since Feb.  Each start-up it has plenty of power!  This same type of battery is used in many Uninterruptible Power Supplies (UPS), for computers as well.  Here are a few pics of the installed battery and a link to some that are on ebay right now. 

http://cgi.ebay.com/POWERTRON-PT1212-12VOLT-RECHARGEABLE-BATTERIES_W0QQitemZ200226911159QQcmdZViewItem?hash=item200226911159&_trkparms=72%3A552%7C39%3A1%7C65%3A12&_trksid=p3286.c0.m14

Nice writeup!

Makes me think of the sealed Wal Mart battery Buddha is always ranting about:
http://gstwins.com/gsboard/index.php?topic=10483.msg86862#msg86862
http://gstwins.com/gsboard/index.php?topic=6936.msg57865#msg57865
http://gstwins.com/gsboard/index.php?topic=40511.msg455200#msg455200
http://gstwins.com/gsboard/index.php?topic=39007.msg438127#msg438127
http://gstwins.com/gsboard/index.php?topic=32360.msg358754#msg358754

Any idea how their specs compare?

I use a sealed battery designed for the gs , that i bought from a Bike shop , after seing that post about the acid dripping , and went to check mine , and i didnt have a drain

                

I caught that on the other thread.That's cool.I may just have to try it next time I need a battery.