Theis-what about when you are not with the boat? Do you leave the Rule 'on the ready' incase a slow leak develops or some other event occurs that causes a minor leak? Obviously a blown scupper hose would quickly drain the battery bank and unless some kind and caring individual stepped in at first notice of a constantly running bilge pump she'd probably sink at the dock.
which-
leads me to believe that you should never leave your boat-Ebb-since you'll spend much, much more time on your craft maybe more than one hand operated bilge pump hooked in concert with the same pump lever would be the way to go for primary pump. Save the the battery for more important things, radio and lights. That way each direction of the stroke would move water overboard. I dunno-just a thought. Tony G