TechOrbits replacement battery for Dell Latitude E Series E6400 E6400 ATG E6500 E8400 E6410 E6510 Presicion M2400 M4400 M6400,fits 312-0748 312-0749 PT434 NM633 KY265 KY266 KY268 KY477 PT437 PT436 PT435 FU268 FU272 FU274 FU571 MN632 MP307 MP303 6 cell 4400mAh