TPE [Samsung Cell] High Performance Laptop Battery for Lenovo (IBM) ThinkPad R61 T61 R61i R61e T400 R400 Series fits 42T5225 42T5227 42T5264 43R2499 42T4530 42T4531 series (ONLY for Laptops of 14.1) [11.1V 5200mAh 58WH] Grade Samsung cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. Battery type: Li-ion; Capacity: 5200mAh 58WH; Cells: 6-cell; Voltage: 11.1V. CE-/FCC-/RoHS-Certified for safety. 24 x 7 email support, 12-month hassle-free warranty. 100% New from Manufacturer. Up to 500 recharge cycles over the life of the battery. 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.