LB1 High Performance Battery for Dell Latitude E5540, E5440, Compatible Part #: 0M7T5F, 0FT6D9, 0K8HC, 1N9C0, 7W6K0, CXF66, F49WX, NVWGM, VJXMC, VVONF, WGCW6 Laptop Notebook (4 Cells 14.8V)(LB-DE105-26-LAT-E5540-B-Y) Battery Type: Li-ion; Capacity: 2600mAh/38Wh; Cells: 4-cell; Voltage: 14.8V 100% Brand New from Manufacturer. Rechargeable Up to 500 times over life of battery. 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.