12 Cells Replacement Acer Aspire 4310 4520 4710 4720 4920 Series Battery fits fits AS07A41 AS07A31 AS07A32 series with A AGPtek USB2.0 SD card (Equivalent) [Cell] 12 [Capacity(mAh)]8800 Color:Black Type:Li-ion Voltage(V)] 11.1 Fit Machine Models: Aspire 4220,4310,4310G,4315,4320,4520,4520G,4710,4710G,4710Z,4715,4715Z,4720,4720G ,4720Z,4920,4920G series Replacement For: AS07A41 AS07A31 AS07A32 Fit model:Aspire 4310 Aspire 4710 Aspire 4520 Aspire 4920 Full 1 year warrant, Batteries are in high grade quality and certified by CE and RoHS.