Dr. Battery Advanced Pro Series Laptop / Notebook Battery for Sony VAIO SVT131290X (4050 mAh) Samsung SDI cell! 60-Day! 2 Year Warranty Type:11.1 Volt Li-ion Advanced Pro Series Laptop Battery; Capacity: 4050 mAh 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. No additional firmware modification needed.Screws are not included.