The vehicle battery provides the electrical power needed to start the engine and operate accessories. Most batteries last 3 to 5 years, depending on climate and usage. Signs of a weakening battery include slow cranking, dim lights, or warning lights on the dashboard. Regularly check terminals for corrosion and ensure they are clean and tightly connected. In colder climates, battery performance can decline faster. Keeping the battery charged and avoiding prolonged idling helps extend its life. If the battery is nearing the end of its lifespan, replacement is recommended to prevent unexpected failure. Choosing a battery with the correct size and cold-cranking amps for your vehicle ensures reliable starts in all conditions.