Which methods verify 28V DC battery health on the ground?

• A. Visual inspection only
• B. Check voltage with a multimeter, perform a load test or hydrometer test (for flooded batteries), and inspect for swelling or leaks
• C. Hydrometer test only
• D. Replace battery without testing

Answer: (B)

Testing a 28V DC battery’s health on the ground requires confirming both electrical performance and physical condition. Begin by measuring the open-circuit voltage with a calibrated multimeter to see if the battery sits near its expected full-charge value. Then run a load test to evaluate how the battery behaves under load; a healthy battery should maintain voltage and deliver the required current without a large drop. For flooded lead-acid cells, perform a hydrometer test to check electrolyte specific gravity, which provides insight into each cell’s state of charge and health. Finally, inspect for swelling, leaks, cracks, or other physical damage, since such signs indicate internal problems that voltage or electrolyte tests alone may miss. Together, these checks give a comprehensive view of battery health. Visual inspection alone can miss electrical faults, and a hydrometer test alone doesn’t assess voltage under load or overall integrity, so combining all three approaches is best.