🔍 Key Concepts

• Specific gravity readings and what they indicate about a lead-acid battery’s state of charge • Normal fully charged specific gravity range for emergency (lead-acid) batteries • Proper sequence of maintenance actions: electrolyte level vs. charging

💭 Think About

• What does a specific gravity of 1.120 tell you about the battery’s state of charge—high, medium, or very low? • When should you add water/electrolyte to a battery: before charging, during charging, or after charging? • Is a statement about the normal fully charged specific gravity range generally correct for emergency lead-acid batteries on vessels?

✅ Before You Answer

• Verify typical fully charged specific gravity for lead-acid cells (commonly around 1.260–1.300 depending on type). • Confirm that low specific gravity indicates a discharged battery needing charge, not just more electrolyte. • Check whether each option is individually correct, and only then decide if “All of the above” can possibly be right.