1. If it is left for too long, the self-discharge rate will be high.
Solution: You should start the car every once in a while.
2. Insufficient charging for a long time.
Solution: Use the charger to charge in time.
3. Overdischarge.
Solution: The two poles of the battery case and charger can be directly connected to the two-pole protection circuit of the battery (pay attention to the polarity, and test the positive and negative poles with a multimeter first). After charging for a few minutes, the battery voltage will rise and the protection circuit can be turned on.
4. The electrolyte is dry or the electrolyte concentration is too high.
Solution: Add distilled water in time to solve the problem.
5. The battery management module is burned.
Solution: Just replace the new battery management module. Million car purchase subsidy