Get from Amazon.com : https://www.amazon.com/gp/product/B002PCS7TW?tag=bromabakery0d-20

Superb Choice Laptop Replacement Battery for HP Pavilion dv61000et COMPAQ Presario CQ40

Product Description :
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