What's the matter with the abnormal charging system of BMW?

[LeJessica]

The abnormal charging of BMW may be caused by: battery leakage, unreliable connection of the charging circuit, or charger damage. The specific information is as follows: 1. Battery leakage: Poor sealing between the upper cover and the bottom tank or cracking of the sealing glue due to collision may cause leakage; acid leakage from the cap valve; acid leakage from the terminal; acid leakage from other parts. 2. Inspection and handling of faults: First, conduct an appearance inspection to find the acid leakage part. Remove the cover to see if there is any trace of acid leakage around the cap valve, and then open the cap valve to observe whether there is flowing electrolyte inside the battery. After completing the above work, if no abnormality is found, a tightness test should be performed (inflate and pressurize in water, observe whether the battery produces and emits bubbles, bubbles indicate acid leakage). Finally, during the charging process, observe whether there is flowing electrolyte produced. If there is, it indicates a production reason. If there is flowing electrolyte during the charging process, it should be drained completely.