New Genuine Lenovo ThinkPad T440 T450 T550 W550 L450 S440 X240 X250 X260 S540 6 Cell Battery 45N1737 Compatible for: ThinkPad X240 series ThinkPad X240S series ThinkPad X250 series ThinkPad X250S series ThinkPad X260 series ThinkPad T440 series ThinkPad T440S series ThinkPad T440i series ThinkPad T450 series ThinkPad T450S series ThinkPad T550 series ThinkPad L450 series ThinkPad L450S series ThinkPad W550S series Lenovo K2450 seriesGeneric