DENAQ 6-Cell 42Whr/3800mAh Li-Ion Laptop Battery for DELL LATITUDE D400. Replaces DELL Parts U0521, 9T255, 0U003, W0628, X0362, X0363, Y0175, 6T087, 6T216, 6T751, 7T093, 7T534, 8T016, 8T063, 8T531, 8T533, 9T119, 9T540, 9T543, 8T0804, 312-0078, 312-0095.