Dr. Battery Advanced Pro Series Laptop/Notebook Battery for Dell Vostro 2520 (4400mAh/48Wh) Samsung SDI cell! 60-Day! 2 Year Warranty Type: 10.8 Volt Li-ion Advanced Pro Series Laptop Battery; Capacity: 4400mAh / 48Wh 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.