T54FJ Replacement Laptop Battery (6 Cell) for Dell Latitude E5420 E5520 E6420 E6520 M5Y0X 312-1163 HCJWT 7FJ92 - 12 Months Warranty Type: Li-ion, Voltage: 11.1V, Capacity: 65Wh, Cell: 6; Color: Black Laptop model: Dell Latitude E5420 E5520 E6420 E6520 Battery model: T54FJ M5Y0X 312-1163 HCJWT 7FJ92 Operation time: Around 2.5 hours, 500+ recharge cycles over Warranty: 90 days money back, free exchange within 12 months