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. See, normal just isn't normal. In the real world, temperature extremes, vibration, short trips down the street and an ever-increasing array of MP3 players, GPS receivers and other devices take a toll on the battery.