This is a 4 cell Brand New REPLACEMENT Battery for IBM. Replacement Battery is designed for use with Lenovo ThinkPad X40 and X41 notebooks. Compatible ThinkPad Models: Lenovo ThinkPad X : X40, X41. Replaces IBM part #s: 92P0999, 92P1000, 92P1001, 92P1002, 92P1003, 92P1005, 92P1009, 92P1080, 92P1119...