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1. Inadequate first charging or long interruption time of charging;

2. No sufficient charging for long time;

3. No timely recharging after discharge;

4. Often excessive charging or deep discharge with small current;

5. Electrolyte density or temperature is too high so that lead sulfate will form and hard to decompose.

6. Lay the battery aside for a long time and without any regular charging;

7. Electrolyte is not pure and large self-discharge;

8. Internal short-circuit or leakage of electricity caused by the water on the surface of battery.

9. Barely plate partially sulfated because of low Level of internal electrolyte liquid surface.