DENAQ 66Whr 8-Cell Li-Ion Laptop Battery Compatible with Multiple DELL Models including Inspiron 2500, 3700, 3800, 4000, 4100, 4150, 500, 8000, 8100, 8200; Latitude C500, C510, C540, C600, C610, C640, C800, C810, C840, CP, CPi, CpiR, CPt, CPx; Precision M40, M50