Section 10
ELECTRICAL SYSTEM
Subsection 03
(CHARGING SYSTEM)
SMR2002-039_10_03A.FM
10-03-7
A hydrometer measures the charge of a battery in
terms of specific gravity of the electrolyte. A fully
charge battery will have a specific gravity between
1.265 to 1.280.
Most hydrometers give a true reading at 21
°
C (70
°
F).
1. Specific gravity 1.265
In order to obtain correct readings, adjust the initial
reading by
adding
.004 points to the hydrometer
readings for each 5.5°C (10°F)
above
21°C (70°F)
and by
subtracting
.004 point for every 5.5°C
(10°F)
below
21°C (70°F).
This chart will be useful to find the correct reading.
Load Test
This is the best test of battery condition under a
starting load. Use a load testing device that has an
adjustable load.
Apply a load of 3 times the ampere-hour rating of
the battery. At 14 seconds into the test, check bat-
tery voltage; if battery is in good condition, it will
have at least 10.5 Vdc.
Battery Storage
CAUTION:
Battery storage is critical for battery
life. Regularly charging the battery during stor-
age will prevent cell sulfation. Keeping the bat-
tery in vehicle for storage may lead to contacts
degradation/corrosion and case damage if freez-
ing occurs. A discharged battery will freeze and
break in area where freezing point is experi-
enced. Electrolyte leakage will damage sur-
rounding parts. Always remove battery from ve-
hicle for storage and regularly charge to keep
an optimal condition.
Disconnect and remove battery from watercraft
as explained in REMOVAL.
Check electrolyte level in each cell, add distilled
water up to upper level line.
CAUTION:
Do not overfill.
The battery must always be stored in fully charged
condition. If required, charge until specific gravity
of 1.265 is obtained.
CAUTION:
Battery electrolyte temperature must
not exceed 50°C (122°F). The casing should not
feel hot.
ELECTROLYTE
TEMPERATURE
OPERATION TO
PERFORM
°C
°F
38
32
27
100
90
80
.012
.008
.004
Add
to the
reading
21
70
CORRECT READING
16
10
4
- 1
60
50
40
30
.004
.008
.012
.016
Subtract
from the
reading
EXAMPLE NO. 1
TEMPERATURE ABOVE 21°C (70°F):
Hydrometer reading: 1.250
Electrolyte temperature: - 1°C (30°F)
Subtract .016 Sp. Gr.
Corrected Sp. Gr. is 1.234
EXAMPLE NO. 2
TEMPERATURE ABOVE 21°C (70°F):
Hydrometer reading: 1.235
Electrolyte temperature: 38°C (100°F)
Add .012 Sp. Gr.
Corrected Sp. Gr. is 1.247
A17E0JA
1
SPECIFIC GRAVITY READING
USING A HYDROMETER
STATE OF
CHARGE
ELECTROLYTE
TEMPERATURE
27°C (80°F)
4°C (40°F)
100%
1.26/1.27
1.27/1.28
75%
1.21/1.22
1.22/1.23
50%
1.16/1.17
1.17/1.18
25%
1.12/1.13
1.13/1.14
0%
1.10 or less
1.11 or less
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