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TP-5695 12/93 Scheduled Maintenance 3-19
each cell should not exceed ±0.01. The battery should
be charged if the specific gravity is below 1.215 at an
electrolyte temperature of 80_ F (26.7_ C).
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
-- 12.2
-- 6.7
-- 1.1
4.4
10
21.1
26.7
32.2
37.8
43.3
48.9
54.4
60.0
65.6
71.1
15.6
+ .032
+ .030
+ .028
+ .026
+ .024
+ .022
+ .020
+ .018
+ .016
+ .014
+ .012
+ .010
+ .008
+ .006
+ .004
+ .002
0
-- .002
-- .004
--. 006
-- .008
-- .010
-- .012
-- .014
-- .016
-- .018
-- .020
-- .022
-- .024
-- .026
-- .028
°C °F
EXAMPLE NO. 1—
Temperature below 80°F (26.7°C)
Hydrometer Reading 1.250
Acid Temperature 20°F (--6.7°C)
Subtract .024 Specific Gravity
Corrected Specific Gravity is 1.226
EXAMPLE NO. 2—
Temperature above 80°F (26.7°C)
Hydrometer Reading 1.235
Acid Temperature 100°F (37.8°C)
Add .008 Specific Gravity
Corrected Specific Gravity is
1.243
The temperature correction amounts to about .004 (4 “points”)
ofspecificgravityforeach 10°F(5.5°C)change intemperature.
Correction
1-787
Figure 3-21. Specific Gravity
Temperature Correction
NOTE
Some battery testers simply have four or five beads in a
tube. Draw electrolyte into the tube. Use instructions
with tester; otherwise see the following chart.
Five Beads Floating—Overcharged
Four Beads Floating—Fully Charged
Three Beads Floating—A Good Charge
One or Two Beads Floating—A Low Charge
No Beads Floating—A Dead Battery
Charging
The engine battery charging circuit will provide a charge
of 12 volts at up to 10 amps.
NOTE
If the battery is used while the craft is docked and the
generator set is not running i.e., auxiliary lights, two-way
radio, etc., the battery will be drained and may not have
enough power to start the generator set later. Therefore,
it may be necessary to connect a battery charger while
the craft is docked and running on shore power.