What does corrosion on battery terminals cause?

• A. Poor electrical connection
• B. Increased voltage
• C. Longer battery life
• D. Improved conductivity

Answer: (A)

Corrosion on battery terminals creates a crust that acts like an insulating layer, raising resistance at the connection and preventing current from flowing freely. Because the circuit can’t carry as much current, the electrical system can’t draw what it needs—especially during starting or charging—leading to a weak or intermittent connection. This makes poor electrical connection the correct result of terminal corrosion. It doesn’t increase voltage, and it won’t extend battery life or improve conductivity; in fact, it reduces conductivity and can hasten failures. If you’re dealing with this, clean the terminals, dry them, protect with anti-corrosion material, and ensure tight, clean connections.