LB1 High Performance battery for IBM Lenovo Thinkpad Edge E540 Laptop Notebook Computer for IBM Lenovo 45N1054 6 Cells Battery Type: Li-ion; Capacity: 4400mAh/48Wh; Cells: 6-cell; Voltage: 10.8 V Premium Grade A cells ensures peak performance and reliability. Operation time depends on the capacity of the battery, laptop settings, power consumption of equipment, and how you use it. CE-/RoHS-/FCC- Certified and Built-in circuit protection ensure both safety and stability. Live Support Mon-Fri 4am-8pm PST | Sat-Sun 8am-5pm PST | 18 Months Hassle-Free Warranty. Battery for IBM Lenovo Thinkpad Edge E540 IBM Lenovo 45N1054