CSE&reg; New Laptop Battery [14.8V, 5200mAh, 8 Cell Li-ion] for IBM ThinkPad X40, X41 Series, Compatible Part Numbers: 92P0999, 92P1000, 92P1001, 92P1009, 92P1078, 92P1146, 92P1148, FRU 92P0998, FRU 92P1143, FRU 92P1145, FRU 92P1147 - 12 Months 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.