Go to Amazon.com : http://www.amazon.com/gp/product/B005BONEHQ?tag=theatrecat-20

ACER ASPIRE 5740 5740G 5740-5144 5740-5255 5740-5367 5740-5513 5740-5749 5740-5780 5740-5847

Type Li-Ion Voltage111V 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