Visual inspection of batteries must include which items?

• A. Check for corrosion
• B. Tightness of connections
• C. Check the electrolyte level
• D. All of the above

Answer: (D)

Visual inspection of batteries targets issues that can directly affect safety and performance. Corrosion at the terminals or on the battery case signals chemical leakage or reaction products and can impede current flow or create exposure hazards. Tight connections are crucial because loose terminals raise resistance, generate heat, and increase the risk of arcing under load. Checking the electrolyte level is important for open or maintenance-accessible batteries; low levels expose plates, reduce capacity, and can lead to overheating, while overfilling can cause overflow. Since each item points to a distinct potential problem, including corrosion, connection integrity, and electrolyte level, all of these should be part of a thorough visual battery inspection.