Dr. Battery Advanced Pro Series Laptop/Notebook Battery for HP Pavilion dv7-2111us (4400mAh) Samsung SDI cell! 60-Day! 2 Year Warranty Type: 14.4 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 only compatible with 14.4V and 14.8V version.This battery is not compatible with Pavilion dv7-4000 Series and up.