CSEXCEL New Laptop Battery [6 cell 11.1V 5200 mAh] for Acer Aspire Timeline 3820 3820T 3820TG 3820TZ 4820 4820G 4820T 4820TG 5820 5820G 5820T 5820TG 5820TZ 5820TZG, Aspire 4745, 4745G, 4745Z - 12 Month Warranty Battery type: Li-ion; Capacity: 5200mAh/58WH; Cells: 6-cell; Voltage: 11.1V. 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery. CE-/FCC-/RoHS-Certified for safety. 24 x 7 email support,12-month hassle-free warranty. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. Operation time: the actual operation time will depend on how much electricity is required by the device and how you use it.