Go to Amazon.com : http://www.amazon.com/gp/product/B005CS2EV8?tag=theatrecat-20

HP/Compaq Pavilion DV6-2155DX Laptop Battery - Premium Superb Choice? 12-cell Li-ion battery

Type Li-Ion Voltage108V Capacity8800mAh12 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 12-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 6 cells It will still fit in your laptop