What to Do When There's Gas Coming Out of the Small Hole Next to the Car Battery?

[SanFernando]

Add distilled water to slightly below the original water level mark, and use a hydrometer to measure the specific gravity, which should be between 1.25-1.29g/cm³ (at 15°C). If the specific gravity is appropriate, continue adding distilled water to the original water level mark. If the specific gravity is low, add replenishing fluid until the specific gravity is correct. Let the battery stand for 3-6 hours, and only charge it when the electrolyte temperature is below 35°C. The charging time should be about 3-4 hours. During the charging process, when the voltage of a single cell in the battery rises to 2.4V, more bubbles will start to appear in the electrolyte. At this point, the charging current should be halved. After charging is completed, a discharge test should be conducted to ensure that the battery is not just superficially charged due to sulfation damage. If sediment is observed before charging, the battery should be replaced.