Section C - Electrics
Service Procedures
Battery
C-11 C-11
9803-9340-8
Specific Gravity Testing
The specific gravity of the electrolyte gives an idea of the
state of charge of the battery. Readings should be taken
using a hydrometer, when the electrolyte temperature is
15°C (60°F). If the battery has recently been on charge,
wait approximately one hour (or slightly discharge the
battery) to dissipate the surface charge before testing.
Readings should be as tabulated and should not vary
between cells by more than 0.04. A greater variation
indicates an internal fault on that particular cell.
If the electrolyte temperature is other than 15°C (60°F) a
'correction factor' must be applied to the reading obtained.
Add 0.07 per 10°C (18°F) if the temperature is higher than
15°C (60°F) and subtract the same if the temperature is
lower.
Table 2. Specific Gravity at 15°C (60°F)
Fully Charged Half Discharged Fully Discharged
Ambient temperature up to 27°C (80°F) 1.270 - 1.290 1.190 - 1.210 1.110 - 1.130
Ambient temperature above 27°C (80°F) 1.240 - 1.260 1.170 - 1.190 1.090 - 1.110
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