If you don't run an alternator make sure the battery is rated to be used without one. A friend of mine has one of the lightweight Turbostart 16v batteries and it doesn't give you any warning that it is running low. Start up head to the lanes, get ready for the round and nothing. We have found that that particular model is to be used only with an alternator. Don't know which ones are or aren't that way though, sorry I myself run 12v. Just a heads up.
Curtis