I did a 3rd option - realized the observer compartment is the best of all storage spots on the boat and I would hate to waste that space with batteries. Instead, I bought a couple of Deka Group 34m batteries and relocated them to under the observer seat, which is the least use storage place in the boat. Ran 2/0 from the starter/block to my battery switch and ground bus on the amp rack in the observer compartment. The positive wires are all fully covered (and as you can see, not easy to get to even if they were not) so there aren't any safety concerns with their placement. I also use two battery cleats and a battery tie down strap to secure them.