Q: How does extreme heat or extreme cold effect a car battery?
A: During severely cold temperatures, the battery’s cranking power lessens. This is caused by an increase in internal resistance and a lessening of the efficiency of the chemical reactions. A discharged battery can also freeze, causing the casing to crack. During extremely hot temperatures, the battery’s electrolyte can evaporate. When the electrolyte is low, the cranking power is reduced. Extreme heat and extreme cold can decrease the overall life of the battery.