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What is the issue with BMW charging system?

1 Answers

DelTravis

07/30/25 3:26am

Introduction to the causes of BMW charging system abnormalities: 1. Battery leakage: Common leakage phenomena include: a) Poor sealing between the upper cover and the base tank or cracking of the sealing adhesive due to collision causing leakage; b) Acid leakage from the valve cap; c) Acid leakage at the terminal connections; d) Acid leakage at other locations. Measures: First conduct a visual inspection to identify the acid leakage location. Remove the cover plate to check for acid leakage traces around the valve cap, then open the valve cap to observe if there is any flowing electrolyte inside the battery. If no abnormalities are found after these steps, perform an airtightness test - bubbles indicate acid leakage. 2. Battery fails to charge: First check whether the charging circuit connection is reliable, inspect whether the wiring and plug contacts are intact, carefully examine if there is any "sparking" or arcing at the socket and plug, and check for any wire damage or disconnection. Measures: Check whether the charger is damaged and whether the charging parameters meet requirements: initial charging current should reach 1.6-2.5A/cell; maximum charging voltage should reach 14.8-14.9V/cell, charging to float charging transition current should reach 0.3-0.4A/cell, and float charging voltage should reach 14.0-14.4V/cell.

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