Dr. Battery Advanced Pro Series Laptop/Notebook Battery for HP Envy M4-1015DX (4400mAh) Samsung SDI cell! 60-Day! 2 Year Warranty Type: 10.8 Volt Li-ion Advanced Pro Series Laptop Battery; Capacity: 4400mAh Condition: New 60-Day Money Back Guarantee. 2 Year Warranty Battery utilizes high quality Samsung SDI cells for higher performance longer life and more reliability and it guarentees to meet and/or exceed OEM specification Fast charging. Low power consumption. Built-in protection circuit ensures both safety and stability. This battery is not compatible with the following models:Pavilion dv4-(1000 to 4999)Pavilion dv6-(1000 to 6999)Pavilion dv7-(1000 to 6999)