This battery replaces the following part nrs: 0C52861 45N1124 45N1775 45N1128 0C52862 This battery is compatible with the following models Lenovo ThinkPad L Series L450 Lenovo ThinkPad L Series L460 Lenovo ThinkPad L Series L470 Lenovo ThinkPad P Series P50s Lenovo ThinkPad S Series S440 Lenovo ThinkPad S Series S540 Lenovo ThinkPad T Series T440 Lenovo ThinkPad T Series T440s Lenovo ThinkPad T Series T450s Lenovo ThinkPad T Series T550 Lenovo ThinkPad T Series T560 Lenovo ThinkPad W Series W550s Lenovo ThinkPad X Series X240 Lenovo ThinkPad X Series X250 Lenovo ThinkPad X Series X260 Lenovo ThinkPad X Series X270