【Specifications】Battery type : Li-ion ;Voltage: 10.8V. Capacity:48Wh/4.4Ah. Battery life: Up to 500 recharge cycles over the life of the battery. 【Replace Part Number】68+ 0C52861 0C52862 45N1124 45N1125 45N1126 45N1127 45N1128 45N1129 45N1130 45N1131 45N1132 45N1133 45N1134 45N1135 45N1136 45N1137 45N1160 45N1734 45N1735 45N1736 45N1737 45N1738 45N1767 45N1777 45N1775 121500146 121500147 121500148 121500150 【Compatible Model】For Lenovo ThinkPad X240 X250 X260 X270 P50S W550 W550S Series ,ThinkPad T440 T440s T450 T450s T460 T460P T550 T560 L450 L460 Series Notebook . 【Quality Assurance】 New from manufacturer, every battery has passed factory testing, grade A cells ensure fast charges and low power consumption, built-in circuit protection ensures both safety and stability. 【Warranty】30 Days Money Back And 12 Months Exchange Guarantee. if you have any issues, questions or concerns.CONTACT US.We are friendly Customer Support Experts. Please contact through "Your Orders" tab in Amazon account ,we promise to resolve the problem within 24 hours.