Lenovo 4X20E53336 compatible 65W 20V at 3.25 laptop power adapter designed to fit most Lenovo notebooks. Our power adapters are 100% tested and compatible for the systems intended for. Battery life depends on many factors including: available DRAM, screen brightness, applications, features, power management, battery condition and other customer preferences. With our Certification Test Program, we can guarantee your product will work right the first time. Our products are guaranteed by the Magnuson-Moss Warranty Act to not affect or void OEM warranties.