HWG E5540 Battery (6-Cell) Compatible Dell Latitude E5540 E5440 VV0NF 0K8HC 1N9C0 CXF66 WGCW6 0M7T5F F49WX NVWGM (11.1V 5200MAH) Battery type: Li-ion; Capacity: 5200mAh; Cells: 6-cell; Voltage: 11.1V. Compatible Models:Dell Latitude Series ( E5540 / E5440) 100% NEW from manufacturer; Up to 500 recharge cycles over the life of the battery. Every battery has passed factory testing; Durable grade A cells battery; Quality assurance.Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. Warranty: 24 x 7 email support; 12-month hassle-free warranty; Fulfilled by Amazon.