Using pure lead coated terminals at the battery.
Lead outside the battery acts exactly like lead inside the battery. It is very slow to corrode. I used to purchase lead coated copper terminals, from QUICK CABLE but I see they disappeared. Open ocean cannonball commercial weights and shotgun lead has gone the way of the Dodo. I can see shotgun pellets being banned, but few people can consume a 20 pound cannonball. I now pre-coat my terminals by dunking in a solder pot.
Again, this only makes sense if the terminal sits atop a flooded lead acid battery. Tin plating offers around 2% of the lifespan as a comparison.
