3.
Inspection of electrolyte specific gravity (1) Use a hydrometer and measure the specific gravity of the electrolyte
Specific gravity in fully charged state: 1.280 (at 20 O C ) Specific gravity in fully discharged state: 1.150 (at 20 OC) The specific gravity of the electrolyte is expressed by the value at 20 O C as the standard. Specific gravity conversion equation ,S , = St 0.0007 (t-20) :S ,, Specific gravity at 2 0 OC St : Specific gravity at t O C t : Temperature at the time of measurement
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"How to use the hydrometer Insert the nozzle of the hydrometer into the water supply port and suck the electrolyte into the outer cylinder. @ Let the hydrometer in the outer cylinder float correctly without contact with the top, bottom and side wall of the outer cylinder, and read the graduation at the electrolyte surface as shown at left after disappearance of bubbles in the sucked electrolyte. @ After the measurement wash outside and inside of the hydrometer with clear water and wipe thoroughly with clean cloth for storage.
a
Nozzle
4.
Insulation resistance inspection Use an insulation resistance meter (megger) and measure the resistance between the battery and battery case.
Insulation resistance: 1 MQor more Note: If the insulation resistance is less than 1 MQ, remove the battery from the vehicle and wash it with water. Dry the battery case roughly, and measure the insulation resistance again. Install the battery on the vehicle after checking that the insulation resistance is 1 MQor more.