The suspension system of your car is complex. It has shock absorbers, ball joints, struts, and strings. The suspension essentially controls how you handle the vehicle. It also minimizes wear and tear on your car by making it easier for you to go over the bumps in the road.
You don't want to have to walk outside and realize that your car battery has failed. You will probably be able to avoid this if you get the battery replaced when necessary. You can tell whether the battery needs to be replaced by looking at it. If your battery is swollen, then it is time for you to get a new one.