[LeifCarrotson]

I'm not sure what you're putting that in, but there's been some increasing noise in the ski boat world for electrics (eg. [1] and [2]).

Electric power density in either volume or weight is OK in a car, where once you've accelerated you're rolling on low resistance tires on a smooth surface and the weight is less important. But in a boat you're fighting the equivalent of the rocket equation where the force on your planing hull has to have more batteries to lift more batteries to go farther.

It's fine, though, for a lot of watersports uses, where you want to put out hundreds of kW for a few seconds to pop a skier up, do a set, talk to your skier without asphyxiating them in exhaust fumes and without shouting over engine noise, and then plug it back at the dock. Less fine for cruising, where you want a tank of fuel to last you whole day. You only need enough energy storage to outlast human quads and forearms, not more to outlast human bowels!

[1] http://www.ltsmarine.com/english/lts-water-ski-boat/

[2] https://nautique.com/models/super-air-nautique-gs22e/overvie...