Negative Battery Post Corrosion

Neg(-) post/terminal corrosion means under charging.
Pos(+) post terminal corrosion means over charging.

Keeping a battery maintainer/tender on the battery will help to reduce or even eliminate sulphate buildup on posts & terminals.
How is that? I've always heard that corrosion around the battery terminal is related to how well the battery casing is sealed around the terminal. That is why, as battery quality has improved with most battery manufacturers, battery terminal corrosion is getting less and less common. Except for a side post battery in an Alero I used to drive, I haven't had it on any of my cars for many, many years.
 
You want to explain the logic of that statement? ............... I am sorry but my dunce cap is on again and probably too tight making me unable to reason why:unsure:
Oh, not me, I can’t explain the logic. I googled it for this thread.
I’ve heard this before and I believe you can search it out anywhere. So I did a search and the same info came up.

And as-far-as my comment about sulphate(terminal/post corrosion), this comes from [some] of the Mfg’s of the battery maintainer’s, not from me. Sorry if any of the information that I posted sounds like plagiarism, that was not my intent.
 
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Dribble on a paste of baking soda and water. Let it fizz for a minute or two and flush with water. Check in a month. If more corrosion then the post to case seal is probably leaking. Or an Exide. You can try the felt washer. Or clean monthly. Or replace.

You cannot fix the seal.
 
This is a 2013 Kia Sportage. New Interstate battery MT 24F installed exactly 3 years ago last week. 69,800 miles on vehicle.
 
I'm guessing that AGM batteries wouldn't have terminal corrosion issues (?), as there is no liquid battery acid to leak at the posts. I have had two Canadian Tire AGM batteries (in the Buick and the Honda) for five years now, and no problem at all with corrosion. I clean the terminals once a year or so, and use a shot of WD-40 on them.
 
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