4400mAh 6 Cells Replacement Acer Aspire 5520 5720 5920 6920 6920G 7520 7720 7720G 7720Z series Laptop battery AS07B31 AS07B41 AS07B42 AS07B72 CONIS72 series Laptop w/ AGPtek&reg; USB 2.0 SD Card Reader -- Replacement Battery