BRT&reg; Extended Battery Replacement for Dell Latitude E6400, Latitude E6500, precision M2400, precision M4400 series (6-Cell Equivalent) Replace PN:PT434, PT435, PT436, PT437, KY477, KY265, KY266, KY268, FU268, FU274, FU571, MN632, MP303, MP307, NM631, NM633 (Voltage : 11.1V, Capacity:4400mAh)