Dr. Battery Advanced Pro Series Laptop / Notebook Battery Replacement for Sony VPCEB11FX (4400mAh) 800+ Charge Cycles. 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. No additional firmware modification needed.