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SPECIFIC GRAVITY CHECK CHART
CHARGING SYSTEM
Y278ROA
The
specific
gravity
of
battery
electrolyte
changes
with
temperature. Heat thins the solution and lowers the specific
gravity. Cold thicknens the solution and raises the specific
gravity.
A fully charged battery should have a specific gravity between
1.260 and 1.280. with the electrolyte temperature at 80°F. If the
electrolyte temperature is above or below 80°F. the specific
gravity reading must be corrected by adding 4 points (.004) for
each 10° above 80°F or subtracting 4 points for every 10° below
80°F.
Example: The hydrometer reading is 1.280. and the electrolyte
temperature reading is 10°F. By using the chart. the specific
gravity must be lowered by .02B points. The true corrected
reading is 1.252.
1.280-.028
=
1.252
You should never take a hydrometer reading immediately after
water has been added. The water and electrolyte must be mixed
by either charging for a few minutes at a low rate or allowing
the battery to sit for an hour.
CAUTION
A difference of 50 points (0.050) or more between one or
more cells indicates a defective battery. It should be replaced.
ELECTROLYTE
SPECIFIC GRAVITY
TEMPERATURE
IF)
CORRECTION
120
0
-+.016
110
0
- +.012
100°
-+.008
90°
-+.004
80°
-0
70°
--.004
60°
--.008
50°
--.012
40°
--.016
30°
--.020
20°
--.024
10°
--.028
0°
--.032
_laO
--.036
_20
0
--.040
27Y038
27-19
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