Go to Amazon Sites : http://www.amazon.com/gp/product/B006JM1JK8?tag=shitmycatsrea-20
DELL Studio 16 XPS 16 XPS 1640 XPS 1645 XPS 1647 XPS M1640 X411C PN: 312-0814 312-0815 451-10692
Type Li-Ion Voltage111V Capacity6600mAh9 Cells
1 year replacement warranty30-day refund guarantee after the purchase
High Capacity Replacement battery
Each Superb Choice battery was tested at an original laptop by the manufacturer
If your original battery is a 6-cell battery this 9-cell battery has much higher capacity and works longer hours after each charge However it is bigger heavier and sticks out due to the extra 3 cells It will still fit in your laptop
