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For other electrolyte temperatures, use the Temperature Compensation table
below to adjust the Open Circuit Voltage or Specific Gravity readings.
The Open Circuit Voltage will vary for GEL Cell and AGM type batteries, so
check the manufacturer's
Voltmeter Open
Circuit Voltage
Electrolyte
Temperature
Fahrenheit (°F)
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23 -
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specifications.
Digital
Approximate
State-of-Charge
12.65 V
100%
12.45 V
12.24 V
12.06 V
11.89 V
Discharged
Electrolyte
Temperature
Celsius (°C)
160°
71.1°
150°
65.6°
140°
60.0°
130°
54.4°
120°
48.9°
110°
43.3°
100°
37.8°
90°
32.2°
80°
26.7°
70°
21.1°
60°
15.6°
50°
10°
40°
4.4°
30°
-1.1°
20°
-6.7°
10°
-12.2°
0°
-17.8°
Hydrometer
Average Cell
Specific Gravity
1.265
75%
1.225
50%
1.190
25%
1.155
1.120
STATE-OF-CHARGE
[Source: BCI]
Add or Subtract
to
Hydrometer's
SG Reading
+.032
+.028
+.024
+.020
+.016
+.012
+.008
+.004
0
-.004
-.008
-.012
-.016
-.020
-.024
-.028
-.032
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Electrolyte
Freeze Point
-75° F
(-59.4° C)
-55° F
(-48.3° C)
-34° F
(-36.7° C)
-16° F
(-26.7° C)
-10° F
(-23.3° C)
Add or Subtract to
Digital
Voltmeter's
Reading
+.192 V
+.168 V
+.144 V
+.120 V
+.096 V
+.072 V
+.048 V
+.024 V
0 V
-.024 V
-.048 V
-.072 V
-.096 V
-.120 V
-.144 V
-.168 V
-.192 V
Battery Analyzer
Series
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