White or blue-green buildup creates resistance and can mimic battery failure with slow cranking, dim lights, or an intermittent no-start.
Why It Forms
Battery gases, electrolyte residue, heat, humidity, loose connections, and age can contribute. Terminals should be disconnected negative first, cleaned appropriately, and tightened securely.
In Short
Inspecting terminals before replacing a battery can solve a connection problem and prevent unnecessary parts replacement.
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