UBatteries Laptop Battery Acer Aspire 4730Z - 6 Cell, 4400mAh UBatteries Li-Ion Replacement Laptop Battery; Grade A Cell Type: 6 Cell Lithium-Ion | Voltage: 11.1V | Capacity: 4400mAh | Rating: 49Whr CE ROHS Certified One Year Warranty, 30 Days Return