White, blue, or greenish crust around a battery terminal can separate the cable from the metal contact. The battery may be healthy, but the poor connection can still cause slow cranking or a complete no-start.
What Causes Corrosion
- Hydrogen gas venting during charging
- Electrolyte leakage from an older or damaged battery
- Moisture, dust, and road exposure
- Heat, which accelerates the chemical processes involved
Signs to Watch For
- Slow or hesitant engine cranking