CWK New Replacement Laptop Notebook Battery for Acer Extensa 5635, 5635Z, AK.006BT.026, AS09C31, AS09C71 Series AS09C70 Acer Extensa 5235 5635G 5635Z 5635ZG 5620Z 5420G AS09C71 Acer Extensa 5635Z-433G25N 5635Z-434G32N 5635Z-432G16Mn LX.EE50X.050 BT.00605.022 Acer Extensa AS09C31 AS09C71 AS09C75 Acer AS09C31 AS09C71 AS09C75 Gateway NV4001 NV4001C NV4005C NV4400 Acer eMachines E528-2821 E528-2221 E528-2325 E528-2445 E728-4729 Condition: Brand New - Grade A cells Battery Type: Li-ion Voltage: 10.8 Volt (11.1 Volt compatible) Capacity: 5200mAh (Better than 4400mAh) 90 Day Money Back. Buy with confidence!