CSE New Laptop Battery for Acer Aspire 5520 5720 5920 6920 6920G 7520 7720 7720G 7720Z series replace for AS07B31 AS07B41 AS07B42 AS07B72 CONIS72 series Ac Laptop Notebook Main Battery [Li-ion 14.8V 5200mAh 77wHr 8 cells] &ndash; 12 Month Warranty Battery type: Li-ion; Capacity: 5200mAh 77WH; Cells: 8-cell; Voltage: 14.8V. 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 for standard batteries(6-cell, 4400mah): Around 2 hours, the actual operation time will depend on how much electricity is required by the device and how you use it.