For the most laptops , batteries lifespan is about three years . After that they can’t hold much of a charge. You can’t bring back battery’s full capacity , but you can try to stop it from becoming even worse. Our first advice is to run laptop more often on battery power. Don’t let battery to dip bellow 30 percent. Second, when your laptop is turned off and unplugged , keep battery level near to 50 percent. One thing which is fatal for your battery is heat. Keep you battery as cool as possible. Don’t leave your laptop in hot cars in the summer or direct sunlight. Speedfan is good program to check laptop’s internal temperature . In addition, if you not using your laptop for a long time, remove the battery entirely.