Battery keeps getting corrosion on it!

[AJB0009]

@JHZR2
So, what causes this blue/green corrosion? You mentioned it in your previous posts above, but focused more on the white corrosion.
A couple times now I have cleaned everything really well, used a new battery washer and anti-corrosion grease, but it looks like this again in a matter of weeks.
2006 Tacoma. This battery was built 11/17, but it cranks over yet as strong as it did when new, so I hate to part with it.

 

[kschachn]

Blue-green is always characteristic of copper ions and compounds. Copper sulfate here when it reacts with the sulfuric acid.

It can be a brass clamp or the copper wire itself.

 

[JohnnyG]

Yep. That's a leaker.

 

[ripcord]

It could be leaking battery acid where the post comes through the plastic case. All you can do if that's happening is to replace the battery or band-aid it with grease around the joint as a stop gap.

 

[f355spider]

Agreed, the battery is leaking....you can clean it up best you can then cover it with a thick coat of grease as a temporary solution