- Use a hydrometer and thermometer to check the specific gravity of the battery fluid.
Standard value: 1.220 -
1.290 (20°C)
The specific gravity of the battery fluid varies with the temperature, so use the following formula to calculate the specific gravity for 20°C. Use the calculated value to determine whether or not the specific gravity is satisfactory.
D20 = (t-20) X 0.0007 +
Dt
D20: Specific gravity of the battery fluid calculated for 20°C
Dt: Actually measured specific gravity
t: Actually measured temperature