A system for determining a battery condition includes a temperature sensor configured to provide a temperature value associated with the battery, an impedance sensor configured to provide impedance information associated with the battery, and a controller. The controller is configured to determine a threshold impedance associated with a separator membrane of the battery based on an initial impedance of the separator membrane as measured by the impedance sensor and a battery temperature as measured by the temperature sensor, monitor, during operation of the battery, an actual impedance associated with the separator membrane of the battery based on the impedance information and the battery temperature, permit current flow to and from the battery when actual impedance is greater than the threshold impedance, and prevent current flow to and from the battery when the actual impedance is less than or equal to the threshold impedance.