Inspection
Electrolyte Level1. Check whether or not the electrolyte level lies between "UPPER LEVEL" line and "LOWER LEVEL" line.
2. If low, add distilled water to "UPPER LEVEL" line. Do not overfill.
Specific gravity of electrolyte
1. Measure specific gravity with a hydrometer.
Specific gravity: 1.27-1.29 (at 77°F [25°C])