My friend is building a boat and I'm helping him with the electronics equipment required. The meters are all analog dials. He wants to install Sony stereo in the boat. I designed the interiors of the cabin, planning the positions of the stereo. He is going to use aluminum metal sheets as the roof of the cabin. He told me that the same aluminum fabricators will also do the interior works. Now, we will be connecting all the electronic devices to a battery which will be in the cabin. I'm little bit worried about using aluminum cabinet for battery case. Do I have to worry about that? Need advice. Also which battery would be the best choice for it?