Tree.NB High Performance Laptop Battery for Asus A32-X401 X401A X401U, A31-X401 A41-X401 A42-X401, F301 F401 F501 S301 S401 S501 X301 X401 X501 Series - 24 Months Warranty Battery Cells are the most important. Buy with confidence! We have been manufacturing the laptop battery for 11 years. To ensure our customers have 4~5 hours operation time, Tree.NB laptop batteries include only the highest quality battery cells and components. We are passionate about excellence so that with every Tree.NB brand purchase, you can expect to find quality materials, high performance, affordable price! Certified by CE, FCC, RoHS. Rechargeable up to 800 times over life of batteries. Battery type: Li-ion; Capacity: 5200mAh; Cells: 6-cell; Voltage: 11.1V(Compatible with 10.8V) Compatible Battery List: F301, F301A, F301A1, F301U, F401, F401A, F401A1, F401U, F501, F501A, F501A1, F501U, S301, S301A, S301A1, S301U, S401, S401A, S401A1, S401U, S501, S501A, S501A1, S501U, X301, X301A, X301A1, X301Kb815A, X301Ki235A, X301U, X401, X401A, X401A1, X401Eb82A, X401Ec60U, X401Ee45U, X401Ei235A, X401U, X501, X501A, X501A1, X501U, X501Xb815A, X501Xb82A, X501Xc60U, X501Xe45U, X501Xi235A, A31-X401, A32-X401, A41-X401, A42-X401 Warranty: 24 Months warranty, 24 x 7 email support. Tree.NB offers High Quality Laptop battery Brand. If any questions please feel free to contact our customer support for assistance.