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(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.
S20 = St + 0.007(t-20)
(c)Specific gravity and remaining battery charge
Specific
Discharged
gravity
quantity
of electricity
(20 °C)
1.28
1.26
1.24
1.23
(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.
Electrolyte temperature
at measurement
Specific gravity at measurement
Converted specific gravity at 20
Remaining
charge
(%)
0
100
10
90
20
80
25
75
Battery charge measurement
with a hydrometer
Rubber bulb
Glass tube
(%)
Hydrometer structure
How to read hydrometer
31
2. Inspection and adjustment
Float
Float

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