So from replies to another thread I decided on
a pair of flooded dual-purpose Group 27 batts
for my run-about. They will be on an A/B/ALL
switch with a battery combiner to be sure both
batteries get charged.

Gary, check out the thread that I am involved right now called
-alternator over charging-. it is under rec.boats.electronics. see
what they say about the a/b/all switch and how you should not move the
switch while the engine is running or you may cuase damage to the
alternator and other things as well
it was news to me.
by the way I have to 27 batteries made by mega-something maybe
megathon. both the mechanics I used recommended them. oh by the way
they both sold them also/
hope that all is well.
richard