how often should a car battery be replaced?
Normal Life of a Car Battery. When it comes to vehicle maintenance, normal is determined by a number of factors that exist in theory but rarely come to pass. For instance, a battery has an average normal lifespan of four years under normal conditions. Normal in this case means the battery goes through full charge cycles, isn't subjected to extreme temperatures, is attached to a reliable and consistent charging system and isn't providing power for a ton of accessories.