BND Laptop Battery for Lenovo (IBM) ThinkPad X300 X301 Series ; ThinkPad Reserve Edition 8748, fits P/N 42T4518 / 42T4519 / 43R1965 / 42T4522 - 18 Months Warranty [6-Cell 3600mAh/39Wh] Equipped with grade A cells. Charges quickly. Longer discharge time. Steady output and low power consumption. More than 500 times charge-discharge cycles. Built-in circuit protection. Automatic power cut off at high electric current, voltage or temperature ensures safety and extended battery life. All BND Power products are CE-/FCC-/RoHS-Certified by reputable, qualified and accredited testing laboratories.Strict guidelines for compatibility, and standards compliance for product safety and environment safety and guaranteed to Meets or exceeds OEM standards to ensure compliance with environmental and safety requirement. Buy With Confidence. Operation time: 1.5-3 hours. Actual operation time varies depending on types of the device and the way it is used. 24 months hassle-free warranty service.We provide best prices possible on the highest quality products and the most popular brands. Please check if this battery is compatible with your computer before purchasing. Part numbers of compatible batteries and Computers are listed as following.