9 Cell Laptop Battery for Acer Aspire Timeline 3820T, 3820TG, 3820TZ, 4820, 4820G, 4820T, 4820TG, 5820, 5820G, 5820T, 5820TG, 5820TZ, 5820TZG and Aspire 4745, 4745G, 4745Z series laptops Product Type: Li-Lon Laptop Battery Capacity: 11.1v 67Wh ( 9 cell ) Condition: Brand New and 100% OEM Compatible 1 year warranty