Ron,
I didn't realize that AGM batteries maintain their charge indefinitely. I'm a little surprised to hear that when your marina was struck by lightening all the plugged in boats were damaged, I would have thought they would have been protected by their circuit breakers, my boat is protected by two, one on the dock and one on the electrical panel of the boat. It makes one wonder why builders even bother to install them on boats if they don't protect against sudden power surges.
