Dell Inspiron 6400/E1505 laptops were known for good multitasking performance when they were introduced in 2006. Unfortunately, their battery life was considered average when using six-cell batteries. The picture brightened, however, when a nine-cell battery was installed. These larger capacity batteries resulted in outstanding battery life. If you have a Dell Inspiron 6400/E1505 laptop and need a replacement nine-cell battery, USB Phone World is the site to shop for the batteries you need. If you own this laptop and still use a six-cell battery, upgrading to a nine-cell battery is definitely worth the small amount of money that you will invest in this quality product. Our replacement batteries come with a 12-month warranty and customers can purchase a three-year warranty on our batteries. In addition, our batteries include a 30-day satisfaction guarantee.