I use the
Rapala Corded Heavy Duty Electric Knife
I prefer the corded simply because anytime I've chosen battery gear of any type, when I've gone to replace the battery, they either have quit making them or they are crazy expensive because the battery technology has changed.
I love the electric knife. Some fish have bigger, denser bones, and even with a sharp regular knife, can be harder to cut through. The electric knife whips through those quickly, and without effort. Simply makes the job faster and easier.
Here's a link. You won't regret it.
https://www.amazon.ca/Rapala-Heavy-E.../dp/B00F5EK3CG
Oh ... if you want a case for it? It fits perfectly inside a handgun case you can pickup from Cabelas for cheap.