23
clamps using a post and clamp cleaner. Clean terminals will have a bright
metallic shine.
•
Reconnect the clamps to the terminals and thinly coat them with petro-
leum jelly (Vaseline) to prevent corrosion. Keep the area around batteries
clean and dry.
Electrolyte Level and Water
Correct level of the electrolyte is 1" (25 mm) above the plates in each cell.
•
This level will leave approximately ¾" (19.5 mm) of space between the
electrolyte and the vent tube. The electrolyte level is important since any
portion of the plates exposed to air will be ruined beyond repair. Likewise,
too much water will result in electrolyte being forced out of the battery
due to gassing and the increase in volume of the electrolyte that results
from the charging cycle.
• CAUTION:
Do not overfill batteries. The charging cycle will expel electro-
lyte and result in component damage.
•
A battery being charged will “gas” with the majority of the gassing taking
place at the end of the charging cycle. This gas is hydrogen which is lighter
than air. Water and sulfuric acid droplets will be carried out of the bat-
tery vents by the hydrogen gas; however, this loss is minimal. If the battery
electrolyte level is too high, the electrolyte will block the vent tube and
the gas will force it out of the vent tube and battery cap. The water will
evaporate but the sulfuric acid will remain where it can damage vehicle
components and the storage facility floor. Sulfuric acid loss will weaken
the concentration of acid within the electrolyte and reduce the life of the
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