2. Inject distilled water into each hole with a syringe. If the standard electrolyte of 1.28 is added, the electrode plate may be burnt out due to high acid solubility. The acid in the battery will not evaporate, but there is less water. We just need to add about 20-30ml distilled water to each small hole.

3. Let the battery stand for half an hour after charging, so that the sponge around the electrode plate can fully absorb water. Then use a resistor to discharge all the electricity in the battery. If there is no resistance, you can use 12v bulb instead. How to judge that the battery is dying? When the cement resistor is discharged, the resistor is hot at first, and then it gradually ceases to be hot. The battery is dead at this time.

4. Charge the battery after discharge. If possible, pulse charging can be used, because pulse charging can effectively remove the vulcanization of the pole pieces and improve the capacity of the battery. If not, you can use a car instead.

5. After charging, use a syringe to extract excess water from each hole. A ***6 holes, completed step by step. Put on the hat and lid and you can load the car.