What made me think of all of this was something I saw in an accessory catalog I was perusing this past Memorial Day weekend that showed some brass terminal “expanders” for battery terminals. The bottom line is that brass is only about 25% as electrically conductive as copper. Then, as I was flipping through part of my photo library, I ran across this photo on an on-board electrical system on someone’s boat. Check out the brass buss bar. Nothing like consciously creating an inherent weak point right at the main power distribution panel.