A short circuit can result in a sudden loss of voltage or the rapid discharge of high current, both causing the battery to fail. In extreme cases, a short circuit can cause a cell to overheat ...

The short-circuit or puncture causes the battery’s temperature to rise uncontrollably, which can lead to a fire or explosion. It also releases toxic fumes.

Federal investigators on Tuesday said a short circuit was to blame for the failure of a safety system designed to prevent a Red Line train from accelerating and dragging a passenger to his death ...