Bay Valley Parts DELL 0KM742 0KM752 451-10617 KM742 P858D HSTNN-DB74 High Capacity Battery for DELL Latitude E5400 E5410 E5500 E5510 E5550 X 644H [Li-ion 8-cells 14.4V 5200mAh] Battery Type: 9 Cells Li-ion Capacity: 11.1V 7800mAh Color: Black Weight: 19oz Using highest quality materials including grade-A brand-new cells Meets and exceeds OEM specifications and lasts longer hours Package Includes: One unit of brand-new replacement laptop battery for Dell This product is CE & RoHS certified, so BUY WITH CONFIDENCE!!!