Brand new high quality laptop battery for Acer Aspire 4220 4310 4310G 4315 4320 4520 4520G 4710 4710G 4710Z 4715 4715Z 4720 4720G 4720Z 4920 4920G. Compatible part # AS07A41, AS07A31, AS07A32. It comes with a All-in-one card reader as a free gift which is the ideal companion for your digital media. Support SD, MMC, RS-MMC, Mini SD, T-Flash, M2 etc. Plug and play, no external power required. Buy now!