Is the battery box really necessary?
It provides some additional protection and containment if your battery ever leaks acid for any reason. The lid also keeps you from inadvertently shorting the terminals, but I guess that's unlikely if the battery is tucked out of the way.
Should I secure the battery to the floor inside the console with a strap?
Yes. You don't want it to overturn in rough seas (see above). Bouncing small boats are particularly hard on lead acid batteries even under the best of circumstances. AGM and gell batteries will stand up to the pounding better, but they're pricey.




