A car’s battery is  like its heart.  When it stops, the entire vehicle ceases to run. Fortunately, when your car battery dies, you can have it replaced and be back up and running quickly. All batteries do eventually stop working. The  life of a BMW battery  varies depending on how well the vehicle is maintained, as well as how frequently and how far it is driven. But generally, a well-maintained BMW battery can last five or more years before it needs to be replaced.