I will shut down when even I can as I also like the serenity of a quiet drift. But at night with eels in the rocks never. As far as the batteries go I have two and run on only one at a time. I try to switch back and forth each trip so each gets charged and that way I always have a fresh new bat. if something should go wrong.
Always shut down myself, the only time is at night, or fishing the rips, I want to be able to move in a moments notice, and not worry if its going to start?