I Do This For The Glory
Join Date: Dec 1999
Location: Nobleboro, Maine
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Re: Battery terminal corrosion ??
The problem is one of the batteries has coated terminals and the other doesn't.
Part of the buildup is due to electrolysis on the battery terminals, you're in effect electroplating airborne minerals onto the battery terminals. By coating them, they're not prone to this as they have no direct contact with air. This is why coating them eliminates the problem, it puts a barrier between the terminal and the air. Grease, special lubes, and even soap will work.
The rest of the problem is corrosion of the terminals themselves. Coating them, like painting metal so it won't rust, just stops the process by eliminating the air constituent, which the process needs.
If you have copper leads and lead terminals together, now you have dissimilar metals, so you'll get degradation there as well.
The Die Hard probably just has a thin coating of something on the terminals, whereas the other battery was cleaned of this coating.
Same thing with a can of soda. Believe it or not, it's a small battery there. The only thing that prevents the acidic soda (or pop, or tonic, or whatever) from eating through the aluminum can is the thin layer of plastic on the inside of the can. Soda usually has a pH of around 3 by the way, VERY acidic (7 is neutral).
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