Corrosion can imitate a starting problem
Deposits or a loose connection can interrupt current flow and cause slow cranking, flickering lights or intermittent power. The battery may still be usable after the connection is serviced.
Avoid forcing a damaged connection
Do not pull, scrape or twist a heavily corroded terminal without proper protection. Photograph the condition and request inspection if the cable, clamp or battery case appears damaged.
Quick checklist
1Turn off the engine
2Do not touch deposits with bare hands
3Photograph both terminals
4Check for a loose clamp or damaged case