Thanks for the video references, very helpful.
I see the battery floating, and the battery/motor power cord......with plastic plug/socket. Guess that's the key?
Rather like the Panasonic Tough Book PCs. I recall a LOT of little rubber bungs to achieve the IP rating.
Of course, power tool batteries have nothing similar.
Wouldn't want to try floating the battery without the plug/bung in place, but would like to see the video!
Incidentally, strange little green canoe/dory thing being used for the demo. Especially for a guy with a £2500 ish 3hp outboard, and a £90000 ish Tesla X.
?
Wonder why?