Battery Replacement at Advantage Auto Repair & Transmisson in Tucson

The other factor is that the chemical reaction in the battery that creates electrical energy is less efficient when the temperature dips. Let’s say it’s 80 degrees Fahrenheit (27 degrees C) in Tucson. At that temperature, 100% of the battery’s power is available. At freezing, only 65% of battery power is available, but it requires 155% as much power to start the engine as it did at 80 degrees F (27 degrees C).

As you can see, the colder it gets, more power is needed, but the available power drops.