Hi Fireguy,
Lithium batteries are great, but you have to really understand them. See my blog for for info.
http://montana3611rl.blogspot.com/
I ditched the water cooling and run air through the water ports now. I keep getting leaks, and didn't want to take a chance on over torquing bolts and breaking the batteries. The batteries don't really heat up beyond air temperature.
I have the MorningStar Controller set to max volts of 12.02 Volts (80% of full charge), and have lots of power. The relay will disconnect the batteries at 12.06 Volts.