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【Specifications】Battery Type: Li-ion; Voltage: 7.4V; Capacity: 55WH; Battery life: Up to 500 recharge cycles over the life of the battery. 【Compatible Part Number】C4K9V 3H76R 489XN PKH18. 【Compatible Models】Dell XPS 12 9Q23 9Q33 12-L221x 12D-1708 Ultrabook XPS 13 13-L321X 13-L322X XPS L321X L322X Series Notebook. 【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. 【Perfect After-sale】Welcome to email us if you have any issues, questions or concerns, we promise to resolve the problem within 24 hours. We guarantee 30 days money-back and 18-month warranty.