Shibaura ST318, Workshop Manual

Page: 82 / 247

81
6. BATTERY
1) Specifications
Type 12 V Specific gravity of electrolyte 1.28/20°C when fully charged
Capacity 36 AH Charging current 6.5 ampere (normal charging)
2) Specific gravity of electrolyte and charging condition
The specific gravity of electrolyte decreases approximately
lineally in proportion to the discharged electricity of
battery. By measuring the specific gravity of the electrolyte
using a hydrometer, residual capacity of the battery can be
known.
The specific gravity value measured by the hydrometer
should be compensated with respect to temperature. The
specific gravity of battery electrolyte is based on the
temperature of 20°C. As the temperature varies 1°C, the
specific gravity value increases or decreases 0.0007.
Therefore measured values can be compensated by the
following equation.
S20 = St + 0.0007 (t – 20)
7. ENGINE STOP SOLENOID
Inspection
Connect the positive (+) side of the battery to the terminal
of the engine stop solenoid and the negative (
−
) side to the
main body. If the plunger is sucked into the main body, the
engine stop solenoid is normal.
Specific gravity
(20
°
C)
Discharged
electricity (%)
Residual capacity
(%)
1.280 0 100
1.230 25 75
1.180 50 50
1.130 75 25
1.080 100 0
The table indicates relation between the specific gravity
values and battery residual capacity.
T210
Specific gravity converted to
the value at 20°C
Measured specific gravity
Electrolyte temperature in
measured value