2. INSPECTION AND ADJUSTMENT (b) Measurement with hydrometer When using a hydrometer, the measured specific gravity must be corrected according to the temperature at the time of measure- ment. The specific gravity of battery electro- lyte is defined with 20°C as the standard. Since the specific gravity increases or decreases by 0.0007 when the temperature varies by 1°C, correct the value according to the equation below. S20 = St + 0.007(t – 20) Electrolyte temperature at measurement Specific gravity at measurement Converted specific gravity at 20°C (c) Specific gravity and remaining battery charge (3) Terminals Clean if corroded or soiled.
(4) Mounting bracket Repair or replace it if corroded. Retighten if loosened. (5) Battery appearance Replace the battery if cracked or deformed. Clean with fresh water if contaminated. 82E-5 – 98E-5 SERIES 2-11 Specific gravity (20°C) Discharged quantity of electricity (%) Remaining charge (%) 1.28 0 100 1.26 10 90 1.24 20 80 1.23 25 75