Dr. Battery&reg; Advanced Pro Series Laptop / Notebook Battery for Dell Inspiron 15R 5520 (4400mAh)Samsung SDI cell! 60-Day Money Back Guarantee! 2 Year Warranty Type: 11.1 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.