【Specifications】Battery type : Li-ion ;Voltage: 11.55V. Capacity:50Wh 4335mAh. Battery life: Up to 500 recharge cycles over the life of the battery. 【Replace Part Number】C31N1620 31CP5/70/81 C31N162O 0B200-023700000. 【Compatible Model】Asus Zenbook UX430 UX430U UX430UA UX430UN UX430UQ Series; Asus Zenbook U4100U U4100UQ Series; Asus ZenBooK PRO PU404 Series; Asus ZenBooK PRO PU404UF PU404UF8250 PU404UF8550 Series. 【Quality Assurance】100% 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.