How does excessive cold affect my battery?
Extreme cold dramatically reduces the speed at which chemical reaction can occur, while increasing electrolyte resistance. It is important to keep batteries at a full charge during periods of extreme cold. Batteries in a discharged state are susceptible to freezing, which can cause damage to the plates and battery container. Automobiles demand more from a battery in freezing temperatures as the motor oil thickens and makes the engine harder to crank.