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Good find! This has been a problem for some time. 

You can drill a hole use a terminal and use a brass screw and nut. I would wire wheel them to see the brass shine first then put some of this on them.

https://www.amazon.com/gp/aw/d/B0D6R543V...c219e&th=1

I use this on all my electrical connections most certainly on battery connections.

Oh boy, dielectric grease, you’re going to get questions about that! Haha 
Have at least 3-4 flavors of de-ox around at all times. Not to mention Mobil 28 grease for certain things. One thing is guaranteed with de-ox is that it will be all over you by the time you are done.