【Specifications】Battery type : Li-ion ;Voltage: 10.8V. Capacity:48Wh/4400mAh . Battery life: Up to 500 recharge cycles over the life of the battery. 【Replace Part Number】61+ 01AV425 4X50M0881 01AV491 SB10K97582 SB10K97583 01AV426 L18M6P71 SB10K97661 02DL023 . 【Compatible Model】For Lenovo ThinkPad T470 T570 T480 T580 A475 A485 P51S P52S TP25 Series. 【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. CE / FCC / RoHS Certified for safety. 【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.