One crisp, cold morning you go out to start your car and it turns over slowly…then slower…then slower…and then you hear that dispiriting “click…click…click” noise that means you’re not going anywhere.
Why is cold weather so much harder on an automotive battery?
Automotive batteries haven’t changed much in 80 years. They’re comprised of several cells wired together in series; with six cells producing 2.1 volts, it adds up to 12.6 volts at full charge. Each cell contains lead plates acting as a cathode, sulfuric acid as an electrolyte solution, and lead dioxide plates to act as an anode. When the battery discharges, the acid in the electrolyte reacts with the lead plates and changes their surfaces to lead sulfate. As the bat ...[more]