New replacement batteries use better battery cells and are made of the highest-quality materials for an overall life expectancy of over a 1000 charge cycles. Bring your laptop back to life. New 4 cell Li-ion battery is rated at 14.8V/41Wh/2800mAh(Better than 2600mAh). Combined with High Performance cells and smart control chip, you can expect it out-perform, out-gun and out-last any battery out there!