Thanks everyone for the great info and quick replies. I received a very helpful email from someone who reminded me that in the Boeing situation these batteries are not just being drawn down but also charged during use. I can see how that makes a huge difference compared to just drawing down during the flight.

A question and concern from looking at some of these batteries mentioned. In the specs and warnings the manufacturers are warning against submerging these batteries. I don't plan on landing in any water soon but I have heard of gliders having their ballast leak into the rear deck and cockpit. I heard of a 29 doing this so maybe my 27 could possibly have this happen as well. When the batteries get submerged back there and short out. Then what?

Thanks for your patience with us guys lagging behind in so many ways.

Bruno - B4