USTOP Brand New replacement Laptop Battery for ACER Aspire 5230 5310 5315 5330 5520 5530 5710 5720 5730Z 5920 5930G 6530 6920 6930 8730 8930, fits AS07B31 AS07B41 AS07B51 AS07B71 li-ion replacement battery,11.1V/5200MAH 6cell 100% New & 100% OEM Compatible CE FCC Certified for safety 1 year warranty, 30 days money return guarantee