ON-VEHICLE SERVICE
   
  1. 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.
  2. 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
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