I have a catamaran, and all cats have a general rule, the lighter the
better. Batteries are one of the heaviest components on the boat and
I was doing some research and noticed that evercel had a NiZn battery.
Marine grade, can run through far more cycles (around 50% more) than
flooded or AGM, and it's energy density was 2-4x AGM or Flooded deep
cycles. It handles high Amp draws well.
They sold their batteries for electric cars, wheelchairs, electric
trolling motors...

Their 90 AH battery weighed 26 lbs. That's fantastic. Now the bad
news, they are out of business. Too bad really, because it sounds
like they simply didn't know how to market their product as it was only
slightly more expensive than AGMs and it would have been a dream for
full fledged racing boats where every once counts.

That long story said, does anyone know of anyone else making something
similar?

Doug