Battery Service
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ADJUSTED
SPECIFIC GRAVITY READINGS
Temperature
correction is needed because specific gravity changes with temperature.
Cold thickens the electrolyte and raises the specific gravity. Heat
thins the electrolyte and lowers the specific gravity. Hydrometers are
calibrated at 80'F (26.7'C). Electrolyte temperatures above or below
80'F must be adjusted. For
every 10'F increment below 80'F, subtract 0.004 to the hydrometer readings,
and for each 10'F increment above 80'F, add 0.004 to the readings. See
the examples below.
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