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Q
When is a lead-acid battery considered fully charged?
A
when the electrolyte gasses freely
B
when the battery charger ammeter indicates a positive reading
C
when the terminal voltage reaches a constant value at a given temperature
D
when the specific gravity of all cells reaches the correct value and no longer increases over a period of 3 to 4 hours
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Question 1 / 205eccefa3bacbc34ba4d47fe3
Question 1 of 205eccefa3bacbc34ba4d47fe3

When is a lead-acid battery considered fully charged?

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When is a lead-acid battery considered fully charged?

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🔍 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)

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