Almost all car owners look at their cars as one of their priceless investments. So, in order to save yourselves from unwanted expenses know when to change the battery inside your car? How do you even start to answer this question? They usually just say when your battery dies it's time, but sometimes you may not need a new battery yet and other times you may have caused your automobile a lot more damage by not replacing it quicker. A car that is driven a lot or is used a lot may have to have the battery swapped out in as little as two years, but a typical battery has a 3 to six year life span. Sometimes a battery replacement is all a car might need and won't require huge money advances to get.