Vehicle startup failures occur frequently in cold winter, especially on frigid mornings when cars often stall and cannot start. If your vehicle refuses to fire up when you’re ready to head out, a faulty storage battery is the most common culprit.

There are two core reasons for the higher battery failure rate in cold weather:

Low ambient temperature thickens engine oil, increasing mechanical resistance during engine startup. Spark plugs accordingly require far more ignition energy to ignite fuel mixtures. As a result, the battery has to supply a substantially higher amount of electricity to crank the engine in cold conditions.

Cold weather cuts down a battery’s usable capacity and impairs its charging efficiency due to slowed internal chemical reactions inside the cell. While cold cranking demands much more power from the battery, the battery itself becomes less capable of storing and outputting electricity. This creates a conflicting scenario: the engine needs ample power to start, yet the battery cannot deliver sufficient electricity. Under such strain, batteries tend to drain completely and stop functioning.