SKYVAST 9 Cell New Laptop Battery for Dell Latitude E6400 E6500, Dell Precision M2400 M4400 M4500, 4M529 KY266 PT434 - 12 Months Warranty Battery type: Li-ion; Capacity: 90Wh; Voltage: 11.1V; Cells: 9-cell. Fit with laptop models: Dell Latitude E6400 E6500 Precision M2400 M4400 Compatible P/N: 4M529 PT434 NM633 KY265 FU268 MP307 312-0748 Operation time: Around 5 hours. Up to 500 recharge cycles over the life of the battery. Warranty: 12 Months warranty, 30 days money return guarantee.