These batteries should stay cool under most conditions,and are lighter than NiMh, so should be perfect for running a bow thruster, lights, and smoker, and anything else you can think of, all at the same time and without changing the boat's balance too much.
The fast electric boys are going to love them, and I can see benefits for yachts too
Just my opinion, but I think that these are going to be BIG, LiPoly power without the dangerous drawbacks
Not to mention, very fast charge: phones
any thing else you can think of that uses power.