CoolGo&reg; New Laptop Battery for Dell Latitude E5420 E5520 E6420 E6520 Fits T54FJ [Li-ion 6-cell 5200mAh/58WH 11.1V] 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. Grade A cells ensure fast charges and low power consumption; Built-in circuit protection ensures both safety and stability. The actual operation time will depend on how much electricity is required by the device and how you use it. Please make sure that the battery part numbers listed in the description matches the battery part number on your original battery before you purchase.