🔍 Key Concepts

• State of charge in lead-acid batteries and how it is measured • Difference between terminal voltage, gassing, and specific gravity • Role of time stability (no further increase) in confirming a full charge

💭 Think About

• Which measurement directly reflects the chemical condition of each cell rather than just charger output or surface voltage? • What does it mean if a reading (voltage or specific gravity) stops increasing over several hours at the end of charge? • Is visible gassing alone a reliable indicator that all cells are fully charged and balanced?

✅ Before You Answer

• Identify which option includes checking ALL cells, not just overall battery behavior • Look for an option that requires readings to be stable over time (e.g., 3–4 hours) instead of at a single moment • Verify which method is the standard practice for confirming a fully charged lead-acid battery in marine service (hint: think hydrometer readings)