Thanks for the good info! I’ll look into slathering that in. Either that or running better batteries.I think it's causes by the battiers failing. The acid leaks and eats the finish allowing it to oxidized. Usually where I see it is once the batteries start to die. Problem is once it starts, you can never really stop it. Some kinda anti corrosive substance helps to slow it down. But once it wears off it comes back again. Unless you can completely remove it all and seal it up to stop the chemical reaction from happening on the cooper. Moisture accelerates it.
Clean it gently the best you can, and coat it with some kinda anti oxidation may help slow it down some.View attachment 97523
Not sure if "better" batteries stop it. All they need to do it leak a little. I think every type has a chance of doing it. If it over heats, dropped hard, or slight imperfection in the manufacturing could end up in some leaking. I would just make sure your putting in all new equal batteries. Same brand. That way one isn't trying to charge another one. That will drop voltage and increase amps which creates heat.Thanks for the good info! I’ll look into slathering that in. Either that or running better batteries.