Specifications. - Battery type: Li-ion - Voltage: 11.1v also compatible with 10.8v - Capacity: 4400 mAh - Brand: Unbranded /OEM Compatible Models: X240, X240S, X250, T440, T440S, T450, T450S, T460, T460P, T470P, T560, W550, and L450. Compatible part numbers: 45N1128 45N1767 0C52861 45N1124 45N1775 What's in the box Laptop battery