The correct technician is technician b
says that maintenance-free batteries use materials that reduce the amount of water used by the battery.
Which of these tests is the most reliable for figuring out a battery's health?
Particular Gravity. The battery electrolyte's specific gravity can be used to test the status of charge of a battery cell in the most precise and direct manner possible. The state of charge increases with increasing electrolyte specific gravity.
Your lead-acid battery's electrolyte is the liquid inside. Actually, it's a blend of sulfuric acid and water. The electrolyte heats up and some of the water vapors as your battery charges. The water dissipates into hydrogen and oxygen gases via a procedure known as electrolysis.
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