OUWEE Perfect After-saleRest assured with 30 days money-back and 12 months Warranty;24 x 7 email support. Any questions you can contact with us via "Your Orders" tab in account. We are committed to resolving any situation in which our product does not meet your expectations. SpecificationsBattery type: Li-ion. Voltage:11.55V. Capacity: 51.4Wh 4450mAh Cycle times: 500 cycles; Runtime: 60 minutes per charge. Condition: Brand new, from high quality materials, top circuit boards and smart chip. Fully compatible and high stabilityFit for HP Envy 13-ad 13-ad000 13-ad100 13-ad0xx 13-ad1xx 13t-ad000 13t-ad100 Series Notebook. Pass Comprehensive Testing battery for the Laptop has been tested for best capacity and to ensure that all safety requirements are met - all before installation. Safe to UseAll OUWEE products are Certified by UL / CE / FCC / RoHS for safety. Strict guidelines for compatibility, strict quality control standards to ensure the true capacity, stab