Skyvast 11.1V 56Wh New Laptop Battery PT434 for Dell Latitude E6400 E6500, Dell Precision M2400 M4400 Type: Li-ion; Rating: 11.1V / 56Wh; Cell: 6; Color: Grey Operation time: Around 2 hours, 500+ recharge cycles over ABS+PC materials: good gloss, smooth feel, anti-flammability, wear-resisting Warranty: 90 days money back, free exchange within 12 months. Please check if this battery is compatible with your computer before purchasing, Part numbers of compatible batteries and Computers are listed as following