2. Inspection and adjustment
73
(b) Measurement with hydrometer
When using a hydrometer, the measured
specific gravity must be corrected
according to the temperature at the time of
measurement. The specific gravity of
battery electrolyte is defined with 20
°C as
the standard. Since the specific gravity
increases or decreases by 0.0007 when
the temperature varies by 1
°C, correct the
value according to the equation below.
Specific gravity and remaining battery charge
(3) Terminals
Clean if corroded or soiled.
(4) Mounting bracket
Repair or replace it if corroded.
Retighten if loosened.
(5) Battery appearance
Replace the battery if cracked or deformed.
Clean with fresh water if contaminated.
Specific
gravity
(20°C)
Discharged quantity
of electricity
(%)
Remaining
charge
(%)
1.28 0 100
1.26 10 90
1.24 20 80
1.23 25 75
011220-00X
Float
011218-00E
Float
Glass tube
Rubber bulb
011219-00E
Hydrometer structure
How to read hydrometer
S20 = St + 0.007 ( t - 20 )
Electrolyte temperature
at measurement
Specific gravity at measurement
Converted specific gravity at 20
001348-01E
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