What Causes a Car Battery to Overheat and Emit Gas?

[BraydenMarie]

Car Battery to Overheat and Emit Gas? The specific reasons for a car battery overheating and emitting gas are as follows: Reasons for Overheating and Gas Emission: When the battery's separator is of poor quality, for example, if it contains impurities, ions passing through the separator can cause the release of impurities into the electrolyte, leading to a short circuit between the plates. Due to the high short-circuit current, the separator can be scorched and damaged. The more severe the short circuit between the plates, the greater the short-circuit current becomes, creating a vicious cycle. As the damaged area of the separator expands, smoke appears and is expelled through the battery's vent holes, resulting in the battery emitting smoke. Solution: Visit a repair shop or 4S store to have the battery separator inspected and replaced.