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Battery Terminal Corrosion is Often Visible

First, the plastic case of a battery cannot corrode.

When corrosion occurs, it is on the metallic lead terminals and the connector clamps on the battery cables.

What you can see depends on the extent of the corrosion.

Mild corrosion may be nothing more than a dark [often black] film on the terminals and connector clamps.

If the corrosion has been allowed to go on for a long time then one may see evidence of the corrosion in the form of a "fluffy" buildup of powder on the terminals and connector clamps. This powdery buildup is usually a whitish, green to blue-green tint.

The fluffy material is an oxide or salt compound resulting from the combination of the metal in the terminals and connector clamps with the Sulphuric Acid in the liquid battery electrolyte.

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Q: What are the signs of corrision on the car battery?
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