Jerry, Just ran across this in a fishing newsgroup. It may be helpful to you. This gentleman seems to be quite knowledgable about batteries. Go to nyquist.ee.ualberta.ca/~schmaus for a deep cycle battery FAQ. -- Darryl M. Gage dgage@netsync.net Forestville,NY 42:29:19N 079:12:13W http://www.netsync.net/users/dgage