What is the problem when the starter smokes?

[VonHadley]

The reasons for the starter smoking include battery short circuit, circuit aging, and separator damage. Here are the detailed explanations: Battery short circuit: It is most likely caused by poor quality or damage to the separator, allowing the active material of the electrode plates to pass through. If the separator is of poor quality, impurities will form when ions pass through it, leading to a short circuit between the two electrode plates. Due to the large short-circuit current, the separator will be scorched, causing further damage. The more severe the short circuit between the two plates, the greater the short-circuit current, creating a vicious cycle. Eventually, smoke will be emitted from the battery's vent hole, resulting in the phenomenon of the battery smoking. Additionally, conductive objects falling into the battery can also cause a connection between the positive and negative terminals, leading to a short circuit. Circuit aging: Smoking can also be caused by circuit aging. Most cases are due to the battery reaching the end of its lifespan. Separator damage: Separator damage is mostly caused by sparking between the electrode plates.